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New Navigation General Questions from 25 Sept 2012


1

"An electronic or electric device that indicates the rate of turn of a vessel," defines a/an .

magnetic compass

gyro-compass

swing meter

odometer

2

"Proceeding from seaward" for the purpose of the direction of buoying offshore, lateral system buoys would be proceeding .

northerly on the Atlantic Coast

easterly on the Gulf Coast

northerly on the Pacific Coast

None of the above

3

"Revolution" is the .

wobbling of the Earth about its axis

motion of bodies in the solar system relative to the stars

motion of a celestial body in its orbit

spinning of a celestial body about its axis

4

"Rotation" is the .

wobbling of the Earth about its axis

motion of bodies in the solar system relative to the stars

motion of a celestial body in its orbit

spinning of a celestial body about its axis

5

"Space motion" is the .

action causing precession of the equinoxes

motion of a body in the solar system relative to the stars

motion of a celestial body in its orbit

irregularity in the motion of the Earth caused by other celestial bodies

6

"Stand" of the tide is that time when .

the vertical rise or fall of the tide has stopped

slack water occurs

tidal current is at a maximum

the actual depth of the water equals the charted depth

7

"Surface circulation" is another term for .

cyclones

air in motion at all levels of the atmosphere

wind in the lower troposphere

ocean currents

15 of latitude is equal to .

600 miles

900 miles

1200 miles

1500 miles

17 degrees of latitude is equal to .

68 miles

510 miles

1020 miles

4080 miles

90 - Ho = .

sextant altitude

co-latitude

LHA

zenith distance

11

A "Norther" in the Gulf of Mexico is .

a wind shift to the north accompanied by a drop in temperature

a forcible northerly wind of at least 20 knots

a strong northerly wind that generally occurs between November and March

All of the above

12

A backlash below a lock is defined as a .

current setting your vessel on the wall

current setting into the lock chamber

an eddy working along the lower guide wall

current setting counterclockwise

13

A barometer showing falling pressure indicates the approach of a .

high pressure system

low pressure system

high dew point

low dew point

14

A barometric pressure reading of 29.92 inches of mercury is equivalent to .

1013.25 millibars

29.92 feet of water

766 millimeters of mercury

76 centimeters of water

15

A bluff bar is a bar .

extending out from a bluff alongside the river

that tends to give a false indication of its position

that has a sharp drop off into deep water

that is perpendicular to the current

16

A body can only be observed at lower transit when .

the declination is the opposite name to the latitude

the algebraic sum of the colatitudes and declination exceeds 90

the observer is in high latitudes above either polar circle

the body is circumpolar

17

A bold reef is a reef .

with part of it extending above the water

that can be detected by water turbulence

that drops off sharply

perpendicular to the current

18

A boundary between two air masses is a(n) .

lapse rate

isobar

front

continent

19

A bridge over a navigable waterway is being repaired. There is a traveler platform under the bridge's deck that significantly reduces the vertical clearance. If required by the CG district commander, how will this be indicated at night?

Illumination by flood lights

A quick flashing red light at each lower corner

A strobe light visible both up and downstream

Fixed amber lights under the extreme outer edges of the traveler

20

A buoy having red and green horizontal bands would have a light characteristic of .

interrupted quick flashing

composite group flashing

Morse (A)

quick flashing

21

A buoy marking a wreck will show a(n) .

white light FL (2) and a topmark of 2 black spheres

occulting green light and may be lettered

yellow light and will be numbered

continuous quick white light and may be numbered

22

A buoy with a composite group-flashing light indicates a(n) .

bifurcation

fish net area

anchorage area

dredging area

23

A cardinal mark showing an uninterrupted quick- flashing white light indicates the deepest water in the area is on the .

north side of the mark

west side of the mark

east side of the mark

south side of the mark

24

A celestial body will cross the prime vertical circle when the latitude is numerically .

greater than the declination and both are of the same name

less than the declination and both are of the same name

greater than the declination and both are of contrary name

less than the declination and both are of contrary name

25

A celestial body's complete orbit around another body is .

a rotation

a revolution

space motion

nutation

26

A chart has extensive corrections to be made to it. When these are made and the chart is again printed, the chart issue is a .

first edition

new edition

revised edition

reprint

27

A chart position enclosed by a semi-circle is a(n) .

fix

estimated position

dead reckoning position

running fix

28

A chart position enclosed by a square is a(n) .

fix

estimated position

dead reckoning position

running fix

29

A chart with a natural scale of 1:160,000 is classified as a .

sailing chart

general chart

coast chart

harbor chart

30

A chart with a scale of 1:45,000 is a .

harbor chart

coast chart

general chart

sailing chart

31

A chart with a scale of 1:80,000 would fall into the category of a .

sailing chart

general chart

coastal chart

harbor chart

32

A cloud of marked vertical development (often anvil- shaped) would be classified as .

cirrus

cirrocumulus

altocumulus

cumulonimbus

33

A cloud sequence of cirrus, cirrostratus, and altostratus clouds followed by rain usually signifies the approach of a(n) .

occluded front

stationary front

warm front

cold front

34

A coastal chart could have a scale of .

not more than 1:25,000

1:35,000

1:100,000

1:500,000

35

A coastal current .

is generated by waves striking the beach

flows outside the surf zone

flows in a circular pattern

is also known as a longshore current

36

A cold front moving in from the northwest can produce .

thunderstorms, hail, and then rapid clearing

increasing cloud cover lasting for several days

lengthy wet weather

low ceilings with thick cirrus clouds

37

A compass card without north-seeking capability that is used for relative bearings is a(n) .

bearing circle

pelorus

bearing bar

alidade

38

A correction for augmentation is included in the Nautical Almanac corrections for .

the Sun

the Moon

Venus

None of the above

39

A current moving across a lock entrance toward the river or toward the dam is called a(n) .

cutoff

outdraft

lockwash

springpool

40

A current perpendicular to a vessel's track has the greatest effect on the vessel's course made good .

at high vessel speeds

at low vessel speeds

in shallow water

in deep water

41

A cyclone in its final stage of development is called a(n) .

tornado

anticyclone

occluded cyclone or occluded front

polar cyclone

42

A daymark used as a special mark is indicated by which letter in the diagram?

A

B

C

D

D045NG

43

A daymark used to indicate the safe water in a channel will have which of the shapes shown?

A

B

C

D

D045NG

44

A daymark used to indicate the starboard side of the channel when approaching from seaward will have the shape indicated by what letter in illustration D045NG?

A

B

C

D

D045NG

45

A daymark warning of a danger will have the shape indicated by which letter?

A

B

C

D

D045NG

46

A dead reckoning (DR) plot .

ignores the effect of surface currents

is most useful when in sight of land

must be plotted using magnetic courses

may be started at an assumed position

47

A dead reckoning (DR) plot .

must utilize magnetic courses

must take set and drift into account

should be replotted hourly

should be started each time the vessel's position is fixed

48

A deadhead is a(n) .

tree or log awash in a nearly vertical position

crew member who refuses to work

upstream end of a land wall

buoy that is adrift

49

A decrease in barometric pressure is associated with all of the following except .

rising warm air

proximity to a low pressure area

inward spiraling circulation

clear dry weather

50

A Doppler log in the bottom return mode indicates the .

velocity of the current

bottom characteristics

depth of the water

speed over the ground

51

A Doppler log in the volume reverberation mode indicates .

speed being made good

speed through the water

the set of the current

the depth of the water

52

A Doppler speed log indicates speed over ground .

at all times

in the bottom return mode

in the volume reverberation mode

only when there is no current

53

A Doppler speed log indicates speed through the water .

at all times

in the bottom return mode

in the volume reverberation mode

only when there is no current

54

A double star is a star that .

has a declination equal to twice that of the Sun

comprises two stars that appear close together

is twice as bright as a single star

suddenly becomes much brighter and then fades

55

A drawbridge may use visual signals to acknowledge a vessel's request to open the draw. Which signal indicates that the draw will NOT be opened immediately?

A flashing amber light

A fixed red light

A white flag raised and lowered vertically

A flashing white light

56

A easterly wave is located 200 miles due west of your position, which is north of the equator. Where will the wave be in 24 hours?

Farther away to the west

Farther away to the east

In the same place

Closer and to the west

57

A facility used for the discharge of a cargo of a particular hazard, such as chlorine, butane or ethane, must have what to warn water traffic of an immediate danger during fire or cargo release?

An emergency boat and crew

A siren or rotating flashing light

Flashing red lights located one-half mile upstream and downstream of the facility

Buoys with flashing lights controlled from shore, located one-half mile upstream and downstream of the facility

58

A first magnitude star is .

2.5 times as bright as a second magnitude star

3 times as bright as a second magnitude star

5 times as bright as a second magnitude star

10 times as bright as a second magnitude star

59

A flashing green light displayed at a single lock means that the lock is .

ready for entrance

ready for entrance, but gates cannot be closed completely

being made ready for entrance

not ready for entrance

60

A flashing red light displayed at a single lock means that the lock .

is ready to use but vessels must stand clear

is ready to use and vessels may approach

cannot be made ready immediately and vessels shall stand clear

cannot be made ready immediately but vessels may approach

61

A frontal thunderstorm is caused by .

pronounced local heating

wind being pushed up a mountain

a warm air mass rising over a cold air mass

an increased lapse rate caused by advection of warm surface air

62

A gale is characterized by a wind speed of .

10 to 20 knots

34 to 47 knots

48 to 63 knots

64 to 83 knots

63

A general chart could have a scale of .

1:200,000

1:1,000,000

1:50,000

not more than 1:25,000

64

A generally circular low pressure area is called a(n) .

cyclone

anticyclone

cold front

occluded front

65

A great circle crosses the equator at 127W. It will also cross the equator at what other longitude?

127E

53E

27E

27W

66

A great circle crosses the equator at 134E. It will also cross the equator at what other longitude?

46W

124W

134W

34E

67

A great circle crosses the equator at 141E. It will also cross the equator at what other longitude?

180E

41E

141W

39W

68

A great circle crosses the equator at 157W. It will also cross the equator at what other longitude?

157E

57E

23E

57W

69

A great circle crosses the equator at 162E. It will also cross the equator at what other longitude?

62E

126W

162W

18W

70

A great circle crosses the equator at 17W. It will also cross the equator at what other longitude?

173W

117W

163E

17E

71

A great circle crosses the equator at 173E. It will also cross the equator at what other longitude?

7W

73E

73W

173W

72

A great circle crosses the equator at 93W. It will also cross the equator at what other longitude?

13E

87E

177E

177W

73

A great circle track provides the maximum saving in distance on .

easterly courses in high latitudes

southerly courses in high latitudes

westerly courses in low latitudes

easterly courses in low latitudes that cross the equator

74

A great circle will intersect the equator at how many degrees of longitude apart?

0

45

90

180

75

A green buoy has a yellow triangle on it. This is a(n) .

information or regulatory buoy that has lateral significance

buoy that is off-station and is marked to warn mariners of its wrong position

dual purpose marking used where the ICW and other waterways coincide

buoy that was set in error and will be replaced with a red nun buoy

76

A green-and-red banded daymark, green band uppermost, will have the shape shown at letter .

A

B

C

D

D045NG

77

A group of stars which appear close together and form a striking configuration such as a person or animal is a .

cluster

shower

constellation

galaxy

78

A hand held instrument used to measure distances between objects and the ship is a .

vernier

psychrometer

hygrometer

stadimeter

79

A harbor chart could have a scale of .

not more than 1:25,000

1:35,000

1:150,000

not less than 1:500,000

80

A hurricane is characterized by winds of .

up to 33 knots

34 to 47 knots

48 to 63 knots

64 knots or greater

81

A hurricane moving northeast out of the Gulf passes west of your position. You could expect all of the following EXCEPT .

higher than normal swells

high winds

winds veering from south, through west, to northwest

gradual pressure gradient

82

A HYDROLANT warning would normally be sent for all of the following EXCEPT .

extinguishment of Robbins Reef Light in New York City's Upper Bay

unexploded ordinance in ocean waters at a depth of 78 fathoms (143 meters)

the presence of a large unwieldy tow in congested offshore water

a report of an overdue ship

83

A hygrometer is a device used for determining .

the absolute temperature

atmospheric pressure

wind velocity

relative humidity

84

A katabatic wind blows .

up an incline due to surface heating

in a circular pattern

down an incline due to cooling of the air

horizontally between a high and a low pressure area

85

A large automated navigational buoy, such as those that have replaced some lightships, would be shown on a chart by which symbol?

A

B

C

D

D015NG

86

A large group of stars revolving around a center is known as a .

cluster

shower

constellation

galaxy

87

A lateral system buoy displaying a quick light .

should be passed close aboard on either side

indicates that special caution is required

is used at a channel bifurcation or junction

is painted with red and white vertical stripes

88

A latitude line will be obtained by observing a body .

on the prime vertical

on the celestial horizon

at lower transit

on the Greenwich meridian

89

A light characteristic of composite group flashing indicates that there is a(n) .

sharp turn in the channel

narrowing in the channel at that point

junction in the channel

obstruction that must be left to port

90

A light having characteristics which include color variations is defined as .

switching

alternating

oscillating

fluctuating

91

A light that has a light period shorter than its dark period is described as .

flashing

pulsating

occulting

alternating

92

A light, feathery deposit of ice caused by the sublimation of water vapor directly into the crystalline form, on objects whose temperatures are below freezing, is called .

dew

frost

glaze

snow

93

A lighted buoy to be left to starboard, when entering a U.S. port from seaward, shall have a .

white light

red light

green light

light characteristic of Morse (A)

94

A lighted preferred-channel buoy may show a .

fixed red light

Morse (A) white light

composite group- flashing light

yellow light

95

A lighthouse can be identified by its .

painted color

light color and phase characteristic

type of structure

All of the above

96

A lighthouse is 120 feet (36.6 meters) high and the light has a nominal range of 18 miles. Your height of eye is 42 feet (12.8). If the visibility is 11 miles, approximately how far off the light will you be when the light becomes visible?

12.5 miles

16.0 miles

19.0 miles

23.5 miles

97

A line connecting all possible positions of your vessel at any given time is a .

longitude line

latitude line

line of position

fix

98

A line of clouds, sharp changes in wind direction, and squalls are most frequently associated with a(n) .

occluded front

warm front

cold front

warm sector

99

A line of position derived by radar range from an identified point on a coast will be a(n) .

straight line

arc

parabola

line parallel to the coast

100

A line of position formed by sighting two charted objects in line is called a(n) .

relative bearing

range line

track line

estimated position

101

A line of position from a celestial observation is a segment of a .

circle of equal altitude

parallel of declination

parallel of altitude

vertical circle

102

A line of position is .

a line connecting two charted objects

a line on some point of which the vessel may be presumed to be located

the position of your vessel

not used in a running fix

103

A line on a weather chart connecting places which have the same barometric pressure is called an .

isotherm

isallobar

isobar

isotope

104

A line on the Earth parallel to the equator is a .

gnomonic curve

small circle

meridian

great circle

105

A List of Lights entry (L Fl) is a single flashing light which shows a long flash of not less than .

1.0 second duration

1.5 seconds duration

2.0 seconds duration

3.0 seconds duration

106

A local wind which occurs during the daytime and is caused by the different rates of warming of land and water is a .

foehn

chinook

land breeze

sea breeze

107

A low HDOP (Horizontal Dilution of Precision) number such as 2 indicates a .

poor fix

good fix

poor signal quality

good signal quality

108

A low, uniform layer of cloud resembling fog, but not resting on the ground, is called .

cumulus

nimbus

stratus

cirrus

109

A magnetic compass card is marked in how many degrees?

90

180

360

400

110

A major advantage of the NAVTEX system when compared to other systems is that .

the information can be received on an ordinary FM radio

warnings are printed out for reading when convenient

broadcasts are at scheduled times

a low frequency band is used for long distance transmission

111

A marine chronometer should be rewound once every .

12 hours

day

3 days

week

112

A marine sextant has the index arm set at zero and the reflected image of the horizon forms a continuous line with the actual image. When the sextant is rotated about the line of sight the images separate. The sextant has .

error of perpendicularity

side error

prismatic error

centering error

113

A mean sun is used as the reference for solar time for three reasons. Which reason is NOT a cause for use of a mean sun?

The motion of the apparent sun is along the ecliptic.

Measurement of time is along the celestial equator.

The speed of the Earth's revolution is not constant.

There are variations in the Earth's rotational speed.

114

A Mercator chart is a .

cylindrical projection

simple conic projection

polyconic projection

rectangular projection

115

A mercurial barometer at sea is subject to rapid variations in height ("pumping") due to the pitch and roll of the vessel. To avoid this error, measurements of atmospheric pressure at sea are usually measured with a(n) .

syphon barometer

cistern barometer

aneroid barometer

fortin barometer

116

A microbarograph is a precision instrument that provides a .

charted record of atmospheric temperature over time

charted record of atmospheric pressure over time

graphic record of combustible gases measured in an atmosphere

graphic record of vapor pressure from a flammable/combustible liquid

117

A mid-channel buoy, if lighted, will show a .

fixed red light

Morse (A) white light

green light

flashing red light

A millibar is a unit of .

humidity

precipitation

pressure

temperature

119

A mooring buoy, if lighted, shows which color light?

Yellow

White

Blue

Any color except red or green

120

A mountain peak charted at 700 feet breaks the horizon, and your height of eye is 12 feet. What is your approximate distance off (choose closest answer)?

34.7 nm

40.3 nm

55.3 nm

61.6 nm

121

A nautical mile is a distance of approximately how much greater than or less than a statute mile?

1/4 less

1/7 less

1/4 greater

1/7 greater

122

A NAVAREA warning carries the following number; 1986/87 (11). Which statement is TRUE?

The warning was issued in 1986, the 87th sequentially numbered warning and broadcast 11 times.

This is warning number 1986 issued in 1987, and it affects sub-region 11.

This warning is valid in 1986 and 1987 and is the eleventh two-year warning.

The subject of this warning first appeared in 1986; this warning is in 1987 and is the eleventh on this topic.

123

A navigator fixing a vessel's position by radar .

can use radar information from one object to fix the position

should never use radar bearings

should only use radar bearings when the range exceeds the distance to the horizon

must use information from targets forward of the beam

124

A nun buoy will .

be green in color

have an even number

be left to port when entering from seaward

be cylindrical in shape

125

A parallax correction is NOT applied to observations of the .

stars

Moon

Sun

Planets

126

A parallel of latitude other than the equator is a .

great circle

loxodromic curve

small circle

gnomonic curve

127

A phase correction is applied to observations of .

the Sun

stars

planets

All of the above

128

A phase correction may be applicable to correct the sextant altitude correction of .

any star

the Sun

third magnitude stars only

some planets

129

A phenomenon where the atmospheric pressure is higher than that of other surrounding regions is called .

the "trade winds"

a low front or an occluded front

a high pressure area; an anticyclone; or a "high"

the "doldrums"

130

A pillar buoy is indicated by which letter shown in the illustration?

A

B

C

D

D044NG

131

A pilot chart does NOT contain information about .

average wind conditions

tidal currents

magnetic variation

average limits of field ice

132

A plane perpendicular to the polar axis will never form what line on the Earth's surface?

Great circle

Equator

Small circle

Meridian

133

A plane that cuts the Earth's surface and passes through the poles will always form .

the equator

a loxodromic curve

a small circle

a meridian

134

A plane that cuts the Earth's surface at any angle and passes through the center will always form .

the equator

a great circle

a small circle

a meridian

135

A position obtained by applying only your vessel's course and speed to a known position is a .

dead-reckoning position

fix

probable position

running fix

136

A position obtained by applying ONLY your vessel's course and speed to a known position is a .

fix

dead-reckoning position

running fix

probable position

137

A position obtained by applying ONLY your vessel's course and speed to a known position is a .

fix

running fix

dead-reckoning position

probable position

138

A position obtained by applying ONLY your vessel's course and speed to a known position is a .

running fix

probable position

fix

dead-reckoning position

139

A position obtained by taking lines of position from one object at different times and advancing them to a common time is a(n) .

dead-reckoning position

estimated position

fix

running fix

140

A position on the Earth has a longitude of 7410'E. Its celestial counterpart would have a .

GHA of 28550'

SHA of 7410'

SHA of 28550'

LHA of 7410'E

141

A position that is obtained by applying estimated current and wind to your vessel's course and speed is a(n) .

estimated position

dead reckoning position

fix

None of the above

142

A position that is obtained by using two or more intersecting lines of position taken at nearly the same time, is a(n) .

dead-reckoning position

estimated position

fix

running fix

143

A power-driven vessel operating in a narrow channel with a following current, on the Western Rivers, is meeting an upbound vessel. Which statement is TRUE?

The downbound vessel has the right-of-way.

The downbound vessel must initiate the required maneuvering signals.

The downbound vessel must propose the manner and place of passage.

All of the above

A preferred-channel buoy may be .

lettered

spherical

showing a white light

All of the above

145

A preferred-channel buoy will show a .

white light whose characteristic is Morse (A)

group-occulting white light

composite group- flashing (2 + 1) white light

composite group- flashing (2 + 1) red or green light

146

A psychrometer has two thermometers that provide dry bulb and wet bulb temperatures. By comparing these two temperature readings with a set of tables you can determine the .

atmospheric pressure

wind speed

relative humidity and dew point

wind chill factor

147

A radar contact will remain stationary on a relative motion radar display only when it is .

on the same course as your vessel

at the same speed as your vessel

on the same course and speed as your vessel

on a reciprocal course at the same speed as your vessel

148

A radar display which is oriented, so that north is always at the top of the screen, is called a(n) .

relative display

composite display

stabilized display

unstabilized display

149

A radar range to a small, charted object such as a light will provide a line of position in which form?

Straight line

Arc

Parabola

Hyperbola

150

A rapid rise or fall of the barometer indicates .

heavy rain within six hours

a decrease in wind velocity

a change in the present weather conditions

that fog will soon set in

151

A red triangular daymark marks .

the centerline of a navigable channel

the starboard side of a channel

a prominent object of navigational interest that has no lateral significance

an area of a channel where passing another vessel is permitted

152

A relative bearing is always measured from .

true north

magnetic north

the vessel's beam

the vessel's head

153

A revised print of a chart is made .

after every major hydrographic survey of the area covered by the chart

when there are numerous corrections to be made or the corrections are extensive

when a low-stock situation occurs and minor corrections are made

every two years to update the magnetic variation information

154

A rock and sand structure extending from the bank of the river toward the channel is known as a .

wingdam

towhead

cutoff

landwall

155

A rotary current sets through all directions of the compass. The time it takes to complete one of these cycles, in a locale off the East coast of the US, is approximately .

2 1/2 hours

3 1/2 hours

6 1/4 hours

12 1/2 hours

A safe water daymark has what shape?

Triangular

Diamond

Circular

Octagonal

A safe water mark may be .

vertically striped

spherical

showing a white light

All of the above

158

A sailing chart could have a scale of .

not more than 1:25,000

1:35,000

1:100,000

1:700,000

159

A sea breeze is a wind .

that blows towards the sea at night

that blows towards an island during the day

caused by cold air descending a coastal incline

caused by the distant approach of a hurricane

160

A section of the river that is narrower than usual and is often navigable from bank to bank is a .

chute

stabilized channel

slough

navigable pass

161

A semidiameter correction is applied to observations of .

Mars

the Moon

Jupiter

All of the above

162

A series of brief showers accompanied by strong, shifting winds may occur along or some distance ahead of a(n) .

upper front aloft

cyclone

occluded front

cold front

163

A sextant having an index error that is "off the arc" has a .

positive correction

dip error

negative correction

semidiameter error

164

A sextant having an index error that is "on the arc" has a .

positive correction

dip error

negative correction

semidiameter error

165

A ship is in longitude 5400'W on a true course of 090. The ship's clocks are on the proper time zone. At what longitude should the clocks be changed to maintain the proper zone time?

4500'W

5230'W

6000'W

6730'W

166

A ship is in longitude 5400'W on a true course of 270. The ship's clocks are on the proper time zone. At what longitude should the clocks be changed to maintain the proper zone time?

4500'W

5230'W

6000'W

6730'W

167

A ship is on course 195 at a speed of 15 knots. The apparent wind is from 40 on the port bow, speed 30 knots. The direction and speed of the true wind are .

068T, 30 knots

127T, 21 knots

263T, 42 knots

292T, 42 knots

168

A sidereal day is approximately how much shorter than a solar day?

4 minutes

8 minutes

12 minutes

16 minutes

169

A sidereal day is shorter than a solar day. This difference is due to .

irregularities in the daily rotational rate of the Sun

the space motion of the solar system

the precession of the equinoxes

the use of different reference points

170

A sign of thunderstorm development is a cumulus cloud .

darkening, growing in size and forming an anvil top

that shows extensive vertical development

creating cold downdrafts that are felt on the ground

All of the above

171

A single barometric pressure reading of 28.60 indicates .

rapidly improving weather

deteriorating weather

a severe low pressure system

fair weather and calm

172

A single line of position combined with a dead- reckoning position results in a(n) .

running fix

fix

estimated position

assumed position

173

A single vertical magnet placed underneath the compass in the binnacle is used to compensate for .

the horizontal component of the permanent magnetism

deviation caused by the vessel's inclination from the vertical

induced magnetism in the horizontal soft iron

induced magnetism in the vertical soft iron

174

A sling psychrometer is a(n) .

type of cargo gear

instrument used in celestial navigation

instrument used to measure relative humidity

instrument used to measure specific gravity

175

A sling psychrometer is used to measure .

seawater temperature

engine temperature

dry bulb and wet bulb temperatures

barometric pressure

176

A slow rise in the barometric pressure forecasts .

rainy weather for the next 48 hours

high seas

improving weather conditions

deteriorating weather conditions

177

A slow, gradual fall of the barometer indicates approaching .

gale force winds within 12 hours

blizzard conditions

deteriorating or unsettled weather

heavy, wind driven rain

178

A source of an air mass labeled mTw is .

the equator

the Gulf of Mexico

Alaska

Canada

179

A special daymark is a .

red-and-white octagon

daymark with a yellow stripe on it

green square

yellow diamond

180

A special mark (yellow buoy), if lighted, may exhibit which light rhythm?

Flashing

Morse "A"

Equal interval

Occulting

181

A special purpose buoy shall be .

lighted with a white light

striped black and red

lighted with a red light

yellow

A spherical buoy may be .

numbered

lettered

green

red

183

A star is observed at lower transit. The line of position derived from this sight is .

on the prime vertical

a latitude line

a longitude line

of no special significance

184

A star that suddenly becomes several magnitudes brighter and then gradually fades is a .

double star

variable star

nova

nebula

185

A steep barometric gradient indicates .

calms

light winds

strong winds

precipitation

186

A storm's track is characterized by all of the following except .

the direction the storm has come from

the direction in which the storm is moving

the speed at which the storm is moving

the path taken by the storm

187

A strong, often violent, northerly wind occurring on the Pacific coast of Mexico, particularly during the colder months, is called .

Tehuantepecer

Papagayo

Norther

Pampero

188

A structure, usually made of stone, or cement pilings, which extends from the bank at approximately right angles to the current is called a .

dike

revetment

cutoff

crib

189

A survey (special purpose mark) buoy .

must be lighted

may have a flashing red light

may have a fixed white light

None of the above

190

A swift current occurring in a narrow passage connecting two large bodies of water, which is produced by the continuously changing difference in height of tide at the two ends of the passage, is called a .

hydraulic current

rectilinear current

rotary current

harmonic current

191

A sylphon cell is a part of a .

maximum thermometer

barograph

thermograph

hygrometer

192

A system of reservoirs and connecting tubes in a gyro compass is called a .

spider element

mercury ballistic

gyrotron

rotor

193

A thin, whitish, high cloud popularly known as "mares' tails" is .

altostratus

stratus

cumulus

cirrus

194

A tide is called diurnal when .

only one high and one low water occur during a lunar day

the high tide is higher and the low tide is lower than usual

the high tide and low tide are exactly six hours apart

two high tides occur during a lunar day

195

A time diagram is a diagram of the celestial sphere as observed from above the .

south celestial pole

north celestial pole

observer's meridian

Greenwich meridian

196

A time diagram is a diagram on the plane of the .

celestial meridian

celestial equator

celestial horizon

principal vertical circle

197

A tow that is properly aligned to pass through a narrow opening between two bridge piers is " ".

on course

headed fair

holding on

in shape

198

A towboat has the same draft as the barges it is pushing ahead. If the distance from the stern of the towboat to the head of the tow is 800 feet, where is the approximate location of the pivot point of the unit?

At the head of the tow

250 feet from the head of the tow

400 feet from the head of the tow

600 feet from the head of the tow

199

A towboat is pushing barges ahead at a dangerously fast speed when .

the towboat vibrates when backing down

the rooster tail exceeds the height of the main deck

a strain is placed on the face wires

water comes over the foredeck of the lead barges

200

A triangular daymark would be colored .

red

red and white

green

green and white

201

A tropical storm is a tropical cyclone that generates winds of .

between 20 and 33 knots

between 34 and 63 knots

over 63 knots

None of the above

202

A tropical wave is usually preceded by .

tropical storms

good weather

heavy rain and cloudiness

heavy seas

203

A true bearing of a charted object, when plotted on a chart, will establish a .

fix

line of position

relative bearing

range

204

A tsunami is caused by a(n) .

tidal wave

storm surge caused by a hurricane or tropical storm

earthquake on the ocean's floor

tornado

205

A type of precipitation that occurs only in thunderstorms with strong convection currents that convey raindrops above and below the freezing level is known as .

sleet

hail

freezing rain

rime

206

A variable star is one that .

exhibits a change in magnitude

has a changing declination

is increasing in SHA

is also known as a red giant

207

A vertex of the navigational triangle is NOT located at the .

elevated pole

celestial body

zenith

coaltitude

208

A vertically-striped buoy may be .

striped black and green

striped black and yellow

lighted with a red light

lighted with a white light

209

A very light breeze that causes ripples on a small area of still water is a .

cat's paw

hog's breath

williwaw

chinook

210

A vessel crossing a river on the Western Rivers has the right of way over .

vessels ascending the river

vessels descending the river

all vessels ascending and descending the river

None of the above

211

A vessel crossing a river on the Western Rivers, must keep out of the way of a power-driven vessel .

descending the river with a tow

ascending the river with a tow

ascending the river without a tow

All of the above

212

A vessel entering the eye of a hurricane should expect .

moderating winds and heavy confused seas to strike his vessel from all directions

the winds to increase to hurricane force and strike from a different direction as the eye passes

the barometer to reach the lowest point

All of the above

213

A vessel heading ENE is on a course of .

022.5

045.0

067.5

090.0

214

A vessel heading ESE is on a course of .

112.5

135.0

157.5

180.0

215

A vessel heading NE is on a course of .

022.5

045.0

067.5

090.0

216

A vessel heading NNE is on a course of .

022.5

045.0

067.5

090.0

217

A vessel heading NNW is on a course of .

274.5

292.0

315.5

337.5

218

A vessel heading NW is on a course of .

274.5

292.5

315.0

337.5

219

A vessel heading SE is on a course of .

112.5

135.0

157.5

180.0

220

A vessel heading SSE is on a course of .

112.5

135.0

157.5

180.0

221

A vessel heading SSW is on a course of .

202.5

225.0

247.5

270.0

222

A vessel heading SW is on a course of .

202.5

225.0

247.5

270.0

223

A vessel heading WNW is on a course of .

270.0

292.5

315.0

337.5

224

A vessel heading WSW is on a course of .

202.5

225.0

247.5

271.0

225

A vessel is proceeding downstream in a narrow channel on the Western Rivers when another vessel is sighted moving upstream. Which vessel has the right of way?

The vessel moving upstream against the current

The vessel moving downstream with a following current

The vessel located more towards the channel centerline

The vessel with the least amount of maneuverability

226

A vessel is steaming in east longitude on January 25 and crosses the International Date Line on an eastbound course at 0900 zone time. What is the date and time at Greenwich when the vessel crosses the line?

0900, 24 January

2100, 24 January

2100, 25 January

0900, 26 January

227

A vessel operating on the Great Lakes, and whose position is southeast of an eastward-moving storm center, would NOT experience .

a falling barometer

lowering clouds and drizzle

a northeast wind

rain or snow

228

A vessel sighting a northern right whale dead ahead should .

maintain course and speed

alter course to give a wide clearance

report the whale's position to the Canadian Coast Guard

All of the above

229

A vessel's position should be plotted using bearings of .

buoys close at hand

fixed known objects on shore

fixed objects

All of the above

230

A warm air mass is characterized by .

stability

instability

gusty winds

good visibility

231

A weather forecast states that the wind will commence backing. In the Northern Hemisphere, this would indicate that it will .

shift in a clockwise manner

shift in a counterclockwise manner

continue blowing from the same direction

decrease in velocity

232

A weather forecast states that the wind will commence veering. In the Northern Hemisphere this indicates that the wind will .

shift in a clockwise manner

shift in a counterclockwise manner

continue blowing from the same direction

increase in velocity

233

A weather front exists when .

air masses of the same temperature meet

air masses of different temperatures meet

many clouds create a differential in air density

two lows are separated by a ridge of higher pressure

234

A white buoy with a blue band is .

an isolated danger mark

a hydrographic data collection buoy

a mooring buoy

marking a restricted area

235

A white buoy with an open-faced orange diamond on it indicates .

danger

vessels are excluded from the area

the buoy is a mooring buoy

operating restrictions are in effect

236

A white buoy with an orange circle marked on it indicates .

danger

vessels are excluded from the area

a mooring buoy

operating restrictions are in effect

237

A white buoy with an orange cross within a diamond marked on it indicates .

danger

vessels are excluded from the area

an anchorage area

operating restrictions are in effect

238

A white buoy with an orange rectangle on it is used to indicate .

danger

a controlled area

an exclusion area

general information

239

A white diamond daymark with an orange border is a(n) .

special mark

information or regulatory mark

lateral aid on the intracoastal waterway

safe water mark

240

A wind vane on a moving vessel shows .

dead reckoning wind direction

true wind direction

apparent wind direction

estimated wind direction

241

Above-normal tides near the center of a hurricane may be caused by the .

high barometric pressure

jet stream

storm surge

torrential rains

242

According to Buys Ballot's law, when an observer in the Northern Hemisphere experiences a northeast wind the center of low pressure is located to the .

northeast

west-southwest

northwest

south-southeast

243

According to Buys Ballot's law, when an observer in the Northern Hemisphere experiences a northwest wind, the center of low pressure is located to the .

northeast

west-southwest

northwest

south-southeast

244

According to Buys Ballot's Law, when an observer in the Southern Hemisphere experiences a northwest wind, the center of the low pressure is located to the .

east-northeast

south-southwest

east-southeast

west-southwest

245

Advection fog is most commonly caused by .

air being warmed above the dew point

saturation of cold air by rain

a rapid cooling of the air near the surface of the Earth at night

warm moist air being blown over a colder surface

246

After a cold front passes the barometric pressure usually .

fluctuates

remains the same

remains the same, with clouds forming rapidly

rises, often quite rapidly, with clearing skies

247

After a cold front passes, the barometric pressure .

drops, and the temperature drops

drops, and the temperature rises

rises, and the temperature drops

rises, and the temperature rises

248

After the passage of a cold front the visibility .

does not change

improves rapidly

improves only slightly

becomes poor

249

Aids to navigation marking the intracoastal waterway can be identified by .

the letters ICW after the aid's number or letter

yellow stripes, squares, or triangles marked on them

white retro reflective material

the light characteristic and color for lighted aids

250

Air circulation is caused or affected by .

the rotation of the earth on its axis

convection currents caused by differences in radiant heating between equatorial and polar regions

mountain ranges

All of the above

251

Air masses near the earth's surface .

move from areas of high pressure to areas of low pressure

are deflected by the earth's rotation in both hemispheres

are deflected by the "Coriolis effect"

All of the above

252

Air temperature varies with .

the altitude above sea level

the season of the year

the latitude or distance from the equator

All of the above

253

All aids to navigation listed in the Mississippi River System Light List are shown as miles from a reference point and on the .

east or west bank

left or right descending bank

port or starboard side of the vessel

left or right ascending bank

254

All echo-sounders can measure the .

actual depth of water

actual depth of water below keel

average depth from waterline to hard bottom

average depth of water to soft bottom

255

All of the following are associated with cumulonimbus clouds EXCEPT .

steady rainfall

hail storms

thunderstorms

tornadoes or waterspouts

256

All of the following can be found on a Pilot Chart EXCEPT information concerning the .

percentage of frequency of wave heights

percentage of poor visibility conditions

sea surface temperatures

amounts of precipitation

257

All persons or vessels within the lock area, including the lock approach channels, come under the authority of the .

dockmaster

dock captain

lockmaster

lock foreman

258

All straight lines represent great circle tracks on a chart based on a(n) .

Mercator projection

polyconic projection

orthographic projection

gnomonic projection

Altair is found in what constellation?

Hercules

Cygnus

Aquila

Capricorn

260

Altocumulus clouds are defined as .

high clouds

middle clouds

low clouds

vertical development clouds

261

An air mass is termed "warm" if .

it is above 70F

the ground over which it moves is cooler than the air

it originated in a high pressure area

it originated in a low pressure area

262

An air mass that has moved down from Canada would most likely have the symbols .

mPk

cPk

cTk

cTw

263

An alternating light .

shows a light with varying lengths of the lighted period

shows a light that changes color

marks an alternate lesser-used channel

is used as a replacement for another light

264

An amplitude of the Sun in high latitudes .

is most accurate before sunrise

is most accurate after sunset

should only be observed when the Sun's lower limb is above the horizon

is most accurate when the Sun's center is observed on the visible horizon

265

An anemometer on a moving vessel measures .

apparent wind speed only

true wind speed and true wind direction

true wind speed only

apparent wind speed and true wind direction

266

An aneroid barometer is an instrument .

used to measure the speed of wind

in which the pressure of the air is measured

that tells which direction a storm is coming from

used to measure the height of waves

267

An aneroid barometer on a boat should always be .

located in an air- conditioned area

mounted in the passenger compartment

protected by a collision bulkhead

permanently mounted

268

An aneroid barometer reading should be corrected for differences in .

elevation

temperature

wind speed

latitude

269

An automatic identification system (AIS) transponder transmits and receives information broadcasts on ?

10 cm, S-band radar

3 cm, X-band radar

UHF L-band

VHF maritime band

270

An azimuth angle for a body is measured from the .

observer's meridian

Greenwich meridian

body's meridian

zenith distance

271

An ECDIS is required to display which information?

Soundings

Waypoints

Meteorological data

Radar targets

272

An ECDIS is required to display which information?

Radar targets

ARPA vectors

Hydrographic data

All of the above

273

An ECDIS is required to display which information?

Water temperature

Climatology data

Speed of advance

Depth contours

274

An electronic depth finder operates on the principle that .

radio signals reflect from a solid surface

sound waves travel at a constant speed through water

radar signals travel at a constant speed through water

pressure increases with depth

275

An Electronic Plotting Aid (EPA) will drop off a target's vector is more than minutes elapse between each manual plot.

10

6

3

2

276

An important lunar cycle affecting the tidal cycle is called the nodal period. How long is this cycle?

16 days

18 days

6 years

19 years

277

An indirect radar echo is caused by a reflection of the main lobe of the radar beam off the observer's vessel. Which of the following is NOT a characteristic of indirect echoes?

Their bearing is almost constant, even when the true bearing of the contact changes appreciably.

They always appear on a bearing of 90From the true bearing of the contact.

The indirect echoes usually appear in shadow sectors.

When plotted, their movements are usually abnormal.

278

An instrument designed to maintain a continuous record of atmospheric pressure is a(n) .

mercurial barometer

aneroid barometer

barograph

thermograph

279

An instrument that indicates wind direction is known as a(n) .

weather vane, wind vane or wind sock

hydrometer

hygrometer

sling psychrometer

280

An instrument that maintains a continuous record of humidity changes is called a .

thermometer

barometer

hygrograph

thermograph

281

An instrument useful in predicting fog is the .

sling psychrometer

microbarograph

anemometer

aneroid barometer

282

An instrument which maintains a continuous record of temperature changes is called a .

thermometer

barometer

thermograph

hygrograph

283

An isotherm is .

a line on a weather map connecting equal points of both temperature and pressure

an instrument that measures the climatological effects of temperature

a line connecting points of equal barometric pressure on a weather map

a line connecting points of equal temperature on a weather map

284

An occluded front is caused by a(n) .

low pressure area

high pressure area

area of calm air

cold front overtaking a warm front

285

An occluded front on a weather map is colored .

blue line

purple line

dashed blue line

alternate red and blue line

286

An occulting light is one in which .

the period of darkness exceeds the period of light

there is only a partial eclipse of the light

the periods of light and darkness are equal

the period of light exceeds the period of darkness

287

An orange and white buoy indicating a vessel- exclusion area will be marked with what symbol?

Open-faced diamond

Diamond with a cross

Circle

Square

288

An orange and white buoy marking a danger area will have what symbol on it?

Open-faced diamond

Diamond with a cross

Circle

Square

289

An orange and white buoy marking an area where operating restrictions are in effect will be marked with which symbol?

Open-faced diamond

Diamond with a cross

Circle

Rectangle

290

An orange and white buoy with a rectangle on it displays .

directions

distances

locations

All of the above

291

An urgent marine storm warning message would be broadcast on .

2670 KHz

156.80 MHz (VHF-FM Ch. 16)

157.10 MHz (VHF-FM Ch. 22A)

None of the above

292

Aneroid barometers are usually calibrated to indicate atmospheric pressure in .

inches of mercury and centimeters

feet of mercury and millibars

inches of mercury and millimeters

inches of mercury and millibars

Antares is found in what constellation?

Scorpio

Corvus

Libra

Corona Borealis

294

Anticyclones are usually characterized by .

dry, fair weather

high winds and cloudiness

gustiness and continuous precipitation

overcast skies

295

Aphelion is the point where the Sun .

and Moon and Earth form a right angle

and Moon and Earth are in line

crosses the celestial equator

is farthest from the Earth

296

Apparent altitude is sextant altitude corrected for .

parallax and personal error

inaccuracies in the reading and reference level

visibility and magnitude

All of the above are correct

297

Apparent wind speed blowing across your vessel while underway can be measured by a(n) .

barometer

wind vane

anemometer

thermometer

298

As a cold front passes an observer, pressure .

drops and winds become variable

rises and winds become gusty

drops and winds become gusty

rises and winds become variable

299

As a high pressure system approaches, the barometer reading .

stays the same

falls

rises

falls rapidly

300

As a licensed Merchant Marine Officer you are expected to .

obtain a weather forecast before setting out from port

listen to weather forecasts on the radio while enroute

understand all broadcast weather warning information

All of the above

301

As a vessel changes course to starboard, the compass card in a magnetic compass .

remains aligned with compass north

also turns to starboard

first turns to starboard then counterclockwise to port

turns counterclockwise to port

302

As it approaches, a typical warm front will bring .

rising temperatures and falling barometric pressure

falling temperature and pressure

falling temperatures and rising pressure

rising barometric pressure and temperatures

303

As shown in the illustration, which wind speeds are reported at position A?

10 knots

15 knots

20 knots

25 knots

D049NG

304

As shown, the position labeled C was plotted because .

the vessel's speed changed

the vessel's course changed form due North to due East

running fixes are better estimates of true position than dead-reckoning positions

All of the above are correct

D051NG

305

As the South Equatorial Current approaches the east coast of Africa, it divides with the main part flowing south to form the warm .

Agulhas Current

Canary Current

Benguela Current

Madagascar Current

306

As the temperature for a given mass of air increases, the .

dew point increases

dew point decreases

relative humidity increases

relative humidity decreases

307

As the temperature of an air mass decreases, the .

absolute humidity decreases

relative humidity increases

specific humidity decreases

dew point rises

308

As the temperature of the air reaches the dew point, .

rain must develop

fog may form

it begins to snow

water freezes

309

As you enter a channel from seaward in a U.S. port, the numbers on the starboard side buoys .

decrease and the buoys are black

increase and the buoys are green

decrease and the buoys are red

increase and the buoys are red

310

As you enter a U.S. channel from seaward the numbers on the buoys .

increase with the can buoys being even numbered

increase with the can buoys being odd numbered

decrease with the can buoys being even numbered

increase in channels going to the north or west, and decrease in channels going to the south or east

311

As your vessel is heading southward along the east coast of the United States, you encounter a buoy showing a red flashing light. How should you pass this buoy?

Pass it about 50 yards off on either side.

Leave it to your starboard.

Leave it to your port.

Pass it well clear on either side.

312

Ascending and descending air masses with different temperatures is part of an important heat transmitting process in our atmosphere called .

conduction

radiation

convection

barometric inversion

313

Astronomical refraction causes a celestial body to appear .

to the left of its position in the Northern Hemisphere and to the right in the Southern Hemisphere

to the right of its position in the Northern Hemisphere and to the left in the Southern Hemisphere

higher than its actual position

lower than its actual position

314

At 0000 you fix your position and change course to 090T. At 0030 you again fix your position and it is 0.5 mile east of your DR. Which statement is TRUE?

The current is easterly.

The drift is 0.5 knot.

You should alter course to the right to regain the track line.

The current is perpendicular to your track line.

315

At 0000 you fix your position and change course to 270T. At 0030 you again fix your position, and it is 0.5 mile east of your DR. Which statement is TRUE?

The set is 090, drift 0.5 knot.

The set is 090, drift 1.0 knot.

The set is 270, drift 0.5 knot.

The set is 270, drift 1.0 knot.

316

At 0000 you fix your position and plot a new DR track line. At 0200 you again fix your position and it is 0.5 mile east of your DR. Which statement is TRUE?

The current is westerly at 0.5 knot.

You must increase speed to compensate for the current.

The current cannot be determined.

The drift is 0.25 knot.

317

At 0000 you fix your position and plot a new DR track line. At 0200 you again fix your position and it is 0.5 mile west of your DR. Which statement is TRUE?

The set is 090, drift 0.5 knot.

The set is 270, drift 0.25 knot.

The set is 270, drift 0.5 knot.

The set is 270, drift 1.0 knot.

318

At 0600 ZT on 31 January, your position is LAT 0049'S, LONG 8427'E. You are preparing a weather report form, WS Form B-80. How should you encode the first three groups after the call sign if you estimate the wind?

30243, 90008, 30848

31003, 99049, 38427

31003, 99008, 30844

31063, 99049, 58427

D041NG

319

At 1200 ZT, on 31 August, your position is LAT 4314'S, LONG 17544'E. You are preparing a weather report form, WS Form B-80. How should you encode the first three groups after the call sign if you estimate the wind?

01003, 94314, 51757

31003, 99432, 31757

31123, 99432, 31754

31243, 94314, 31757

D041NG

320

At 1200 ZT, on 31 July, your position is LAT 2433'N, LONG 17305'W. You are preparing a weather report form, WS Form, B-80. How should you encode the first three groups after the call sign if you estimate the wind?

01003, 99245, 71731

01243, 92433, 71731

31243, 99245, 71731

31003, 92433, 71730

D041NG

321

At 1800 ZT on 31 October, your position is LAT 2450'N, LONG 9237'W. You are preparing a weather report form, WS Form B-80. How should you encode the first three groups after the call sign if you estimate the wind?

31123, 99929, 70249

31183, 99249, 79237

31243, 99249, 70926

01003, 99248, 70926

D041NG

322

At about GMT 1436, on 3 December, the lower limb of the Moon is observed with a sextant having an index error of 2.5' on the arc. The height of eye is 32 feet. The sextant altitude (hs) is 338.8'. What is the observed altitude?

Ho 418.6'

Ho 429.1'

Ho 436.3'

Ho 442.2'

323

At evening stars, the first stars that should be observed are those with an azimuth in what quadrant?

Southern

Western

Northern

Eastern

324

At evening stars, the last stars that should be observed are those with an azimuth in what quadrant?

Southern

Western

Northern

Eastern

325

At McAlpine L & D, normal upper pool elevation is 420.0 feet (130.8 meters) MSL, equal to 12.0 feet (3.7 meters) on the upper gage. The vertical clearance at the Clark Memorial Highway bridge is 72.6 feet (22.1 meters) above normal pool. What is the clearance if the gage reads 10.6 feet (3.2 meters)?

84.6 feet (25.8 meters)

83.2 feet (25.4 meters)

74.0 feet (22.6 meters)

62.0 feet (18.9 meters)

326

At McAlpine L & D, normal upper pool elevation is 420.0 feet MSL, equal to 12.0 feet on the upper gage. The vertical clearance at the Clark Memorial Highway bridge is 72.6 feet above normal pool. What is the clearance if the gage reads 27.2 feet?

25.4 feet

57.4 feet

60.6 feet

72.6 feet

327

At meridian transit, the diagram used by a navigator to illustrate the angles involved is based on the .

celestial equator as observed from above the south celestial pole

celestial equator as observed from above the north celestial pole

plane of the observer's meridian

plane of the Greenwich meridian

328

At morning stars, the first stars that should be observed are those with an azimuth in which quadrant?

Eastern

Southern

Western

Northern

329

At morning stars, the last stars that should be observed are those with an azimuth in which quadrant?

Eastern

Southern

Western

Northern

330

At the approaches to Savannah, GA, with the wind coming out of the west, the wind-driven current will be flowing approximately .

080

100

260

280

331

At the approaches to Savannah, GA, with the wind coming out of the west, the wind-driven current will be flowing approximately .

280

260

100

080

332

At the magnetic equator there is no induced magnetism in the vertical soft iron because .

the lines of force cross the equator on a 0- 180 alignment

the quadrantal error is 0

there is no vertical component of the Earth's magnetic field

the intercardinal headings have less than 1 error

333

At the master gyrocompass, the compass card is attached to the .

spider element

sensitive element

link arm

pickup transformer

334

At upper transit, if the zenith distance is 34, the geographical distance from the observer to a body's GP is .

510 miles

1220 miles

2040 miles

2260 miles

335

At what angle to the isobars do surface winds blow over the open sea?

About 90

About 50

About 25

About 15

336

At what time after 1400 EST (ZD +5), on 4 January 1983, will the height of the tide at Port Wentworth, GA, be 3.0 feet?

1612

1630

1653

1718

337

Atmospheric pressure at sea level is equal to .

14.7 pounds per square inch

29.92 inches of mercury

1013.25 millibars

All of the above

338

Atmospheric pressure may be measured with a(n) .

barograph

aneroid barometer

mercurial barometer

All of the above

339

Automatic identification systems (AIS) are expected to broadcast all of the following information EXCEPT .

navigation status

ship's heading

port of origin

time stamp

340

Automatic identification systems (AIS) are required to .

provide safety-related information automatically to shore stations, other vessels and aircraft

receive safety-related information automatically from similarly equipped vessels

exchange safety- related information with shore-based facilities

All of the above

341

Barometer readings in weather reports are given in terms of pressure at .

sea level

Washington, D.C.

the weather station

the broadcasting station

342

Barometers are calibrated at a standard temperature of .

0F

32F

60F

70F

343

Because of the reflecting properties of a sextant, if the sextant altitude reads 60 on the limb, the actual arc of the limb from 0 to the 60 reading is .

20

30

40

60

344

Because the actual center of some planets may differ from the observed center, the navigator applies a correction known as the .

phase correction

refraction correction

semidiameter correction

augmentation correction

345

Before a magnetic compass is adjusted certain correctors must be checked to ensure that they are free of permanent magnetism. These correctors are the .

fore-and-aft and athwartships magnets

dip needle and heeling magnet

heeling magnet and Flinders bar

Flinders bar and quadrantal spheres

Bellatrix is found in what constellation?

Canis Minor

Gemini

Taurus

Orion

347

Between the equator and the 46th parallel of latitude, there are 3099 meridional parts. How many degrees of equatorial longitude does 3099 meridional parts represent?

3552'45"

5139'00"

7421'11"

8236'12"

348

Black double-cone topmarks are the most important feature, by day, of cardinal marks. Which of the four topmarks shown indicates the best navigable water lies to the west of the buoy?

A

B

C

D

D030NG

349

Brief, violent showers frequently accompanied by thunder and lightning are usually associated with .

passage of a warm front

passage of a cold front

winds shifting counterclockwise in the Northern Hemisphere

stationary high pressure systems

350

Buoys and day beacons exhibiting a yellow triangle or square painted on them are used .

in minor harbors where the controlling depth is 10 feet (3 meters) or less

on isolated stretches of the ICW to mark undredged areas

where the ICW and other waterways coincide

at particularly hazardous turns of the channel

351

Buoys are marked with reflective material to assist in their detection by searchlight. Which statement is TRUE?

A safe-water buoy will display red and white vertical stripes of reflective material.

All reflective material is white because it is the most visible at night.

A special-purpose mark will display either red or green reflective material to agree with its shape.

A preferred-channel buoy displays either red or green reflective material to agree with the top band of color.

352

Buoys which mark dredging areas are painted .

black

yellow

green

red

353

Buoys which mark isolated dangers are painted with alternating .

red and black bands

green and black bands

red and white stripes

green and white bands

354

Buoys which only mark the left or right side of the channel will never exhibit a light with which characteristic?

Flashing

Quick flashing

Composite group flashing

Equal interval (isophase)

355

By convention, the Earth's north magnetic pole is colored .

red

white

blue

black

356

By convention, the Earth's south magnetic pole is colored .

blue

black

white

red

357

By convention, the north pole of a magnet is painted .

red

blue

white

black

358

By convention, the north seeking ends of a compass' magnets are colored .

black

blue

red

white

359

By convention, the south pole of a magnet is painted .

red

blue

white

black

360

By convention, the south seeking ends of a compass' magnets are colored .

blue

red

white

black

Capella is found in what constellation?

Gemini

Auriga

Libra

Crab

362

Chart correction information is NOT disseminated through the .

Summary of Corrections

Local Notice to Mariners

Daily Memorandum

Chart Correction Card

363

Chart information details to be used in ECDIS should be the latest edition of information originated by a government-authorized hydrographic office and conform to the standards of (the) .

International Maritime Organization

International Hydrographic Organization

NASA

US Coast Guard

364

Chart legends printed in capital letters show that the associated landmark is .

conspicuous

inconspicuous

a government facility or station

a radio transmitter

365

Chart legends which indicate a conspicuous landmark are printed in .

underlined letters

boldfaced print

italics

capital letters

366

Charted depth is the .

vertical distance from the chart sounding datum to the ocean bottom, plus the height of tide

vertical distance from the chart sounding datum to the ocean bottom

average height of water over a specified period of time

average height of all low waters at a place

367

Charts should be corrected by using information published in the .

Light List

American Practical Navigator

Notice to Mariners

Coast Pilot

368

Charts showing the coast of Mexico are produced by the United States .

National Geospatial- Intelligence Agency

Coast Guard

Naval Observatory

National Ocean Service

369

Chronometer error may be found by .

radio time signal

comparison with a timepiece of known error

applying the prevailing chronometer rate to previous readings

All of the above

370

Cirrus clouds are composed primarily of .

ice crystals

water droplets

snow crystals

nitrogen

Cirrus clouds are indicated by which number?

1

4

5

7

D039NG

372

Civil twilight begins at 1910 zone time on 20 July. Your DR position at that time is LAT 2216'N, LONG 15006'W. Which statement concerning the planets available for evening sights is TRUE?

Venus will have a westerly meridian angle.

Mars will set about one hour after the Sun sets.

Mars, Venus, Jupiter, and Saturn will be above the horizon.

Sights of Saturn, Jupiter, and Venus will yield a good three-line- of-position fix.

373

Civil twilight occurs at 0558 zone time on 30 December. Your DR position at that time is LAT 1502'N, LONG 4602'W. Which statement concerning the planets available for morning sights is TRUE?

At 0558, Mars can be used for an ex- meridian observation.

Venus, Jupiter, and Mars sights will yield a good three line fix.

Saturn will be near the prime vertical.

Venus will be visible low in the western sky.

374

Civil twilight starts at 1812 zone time on 26 August, Your DR position at that time is LAT 2106'S, LONG 1456' W. Which statement concerning the planets available for evening sights is TRUE?

Mars will be near the prime vertical in the eastern sky.

Venus may be identified from Saturn and Jupiter because it is the brightest.

Sights of Venus, Jupiter, and Saturn will yield a good three line fix.

A sight of either Jupiter, Saturn, or Venus will give a latitude line.

375

Class I and II private aids to navigation in or along navigable waters of the United States are listed in the .

Sailing Directions

Light List

List of Private Aids

Aids to Navigation Manual

376

Clearance gauges at bridges indicate .

the height of the tide

depth of water under the bridge

charted vertical clearance at mean low water

distance from the water to low steel of the bridge

377

Cloud formations are minimal when the .

surface temperature and temperature aloft are equal

surface temperature and temperature aloft differ greatly

barometric pressure is very low

relative humidity is very high

378

Clouds are classified according to their .

size

moisture content

altitude and how they were formed

location in a front

379

Clouds form .

as a mass of warm, humid air rises into the atmosphere and cools, condensing moisture into small droplets

as winds blow across bodies of water, the sun causes the moisture to be absorbed and move upward forming clouds

dry air compresses moisture from the atmosphere into clouds

when the relative humidity of the atmosphere is low

380

Clouds with the prefix "nimbo" in their name .

are sheet or layer clouds

have undergone great vertical development

are middle or high altitude clouds

are rain clouds

381

Coast Pilots and navigational charts are kept corrected and up-to-date by using the .

pilot charts

Notices to Mariners

Tide Tables

Current Tables

382

Cold water flowing southward through the western part of the Bering Strait between Alaska and Siberia is joined by water circulating counterclockwise in the Bering Sea to form the .

Alaska Current

Subarctic Current

Kuroshio Current

Oyashio Current

383

Compared to a low pressure system, generally the air in a high is .

warmer, less dense, and less stable

cool, more dense, and drier

muggy and cloudy

extremely moist with high relative humidity

384

Compass deviation is caused by .

magnetism from the earth's magnetic field

misalignment of the compass

magnetism within the vessel

a dirty compass housing

385

Compass error is equal to the .

deviation minus variation

variation plus compass course

combined variation and deviation

difference between true and magnetic heading

386

Complete information on weather broadcasts throughout the world is contained in .

Selected Worldwide Marine Weather Broadcasts

your local newspaper

the Notice to Mariners

the daily weather map

387

Concerning a celestial observation, the azimuth angle is measured from the principal vertical circle to the .

Greenwich celestial meridian

hour circle of the body

local celestial meridian

vertical circle of the body

388

Considering the general circulation of the atmosphere, the wind system between latitudes 30N and 60N is commonly called the .

prevailing westerlies

horse latitudes

trade winds

subpolar low pressure belts

389

Coral atolls, or a chain of islands at right angles to the radar beam, may show as a long line rather than as individual targets due to .

the effects of beam width

limitations on range resolution

the pulse length of the radar

the multiple-target resolution factor

390

Cumulonimbus clouds are formed by .

vertical air movements

heavy rainstorms

horizontal air movements

any movement of moist air

391

Cumulonimbus clouds are most likely to accompany a(n) .

high pressure system

cold front

warm front

occluded front

392

Cumulonimbus clouds can produce .

dense fog and high humidity

gusty winds, thunder, rain or hail, and lightning

clear skies with the approach of a cold front

a rapid drop in barometric pressure followed by darkness

393

Cumulus clouds that have undergone vertical development and have become cumulonimbus in form, indicate .

clearing weather

that a warm front has passed

probable thunderstorm activity

an approaching hurricane or typhoon

394

Current refers to the .

vertical movement of the water

horizontal movement of the water

density changes in the water

None of the above

395

Cyclones tend to move .

perpendicular to the isobars in their warm sectors

parallel to the isobars in their warm sectors

parallel to the line of the cold front

perpendicular to the line of the cold front

396

Data relating to the direction and velocity of rotary tidal currents can be found in the .

Mariner's Guide

Tidal Current Tables

Nautical Almanac

Tide Tables

397

Daylight savings time is a form of zone time that adopts the time .

one zone to the west

one zone to the east

two zones to the west

two zones to the east

398

Daylight savings time is a form of zone time that adopts the time .

two zones to the east

two zones to the west

one zone to the east

one zone to the west

399

Daymarks marking the starboard side of the channel when going towards the sea are .

green squares

green triangles

red squares

red triangles

Deneb is found in what constellation?

Cygnus

Pegasus

Ursa Major

Andromeda

Denebola is found in what constellation?

Hydrus

Leo

Centaurus

Aquila

402

Descending boats, while awaiting their turn to enter a lock, shall NOT block traffic from the lock. They shall be above the lock by at LEAST .

100 feet

200 feet

300 feet

400 feet

403

Despite weather predictions for continued good weather, a prudent mariner should be alert for all of the following, EXCEPT a sudden .

drop in barometric pressure

drop in temperature

wind shift

squall line

404

Determine the approximate geographic visibility of an object, with a height above the water of 85 feet (25.9 meters), for an observer with a height of eye of 60 feet (18.3 meters).

18.4 nm

19.9 nm

20.8 nm

21.5 nm

405

Determine the duration of the first PM slack water on 3 March 1983, east of the Statue of Liberty, when the current is less than 0.1 knot?

10 minutes

13 minutes

16 minutes

19 minutes

406

Determine the first time after 1200 EST (ZD +5) when the velocity of the current will be 0.5 knot on 18 November 1983, at Marcus Hook, PA.

1221

1226

1239

1312

407

Determine the height of the tide at 1430 EST (ZD +5) at New Bedford, MA, on 10 April 1983.

1.1 feet

1.2 feet

1.4 feet

1.7 feet

408

Determine the height of the tide at 2045 EST (ZD +5) at Augusta, ME, on 8 March 1983.

1.4 feet (0.5 meter)

1.9 feet (0.6 meter)

2.3 feet (0.7 meter)

2.6 feet (0.8 meter)

409

Determine the time after 0300 CST (ZD +6) when the velocity of the tidal current will be 0.5 knot on 16 April 1983, at Port Arthur Canal Entrance, TX.

436

507

538

554

410

Determine the time after 0730 EST (ZD +5) when the velocity of the current will be 2.1 knots on 26 March 1983, at Fort Pulaski, GA.

802

812

821

840

411

Deviation in a compass is caused by the .

vessel's geographic position

vessel's heading

earth's magnetic field

influence of the magnetic materials of the vessel

412

Deviation is caused by .

changes in the earth's magnetic field

nearby magnetic land masses or mineral deposits

magnetic influence inherent to that particular vessel

the magnetic lines of force not coinciding with the lines of longitude

413

Deviation is the angle between the .

true meridian and the axis of the compass card

true meridian and the magnetic meridian

magnetic meridian and the axis of the compass card

axis of the compass card and the degaussing meridian

414

Deviation which is maximum on intercardinal compass headings may be removed by the .

Flinders bar

transverse magnets

fore-and-aft magnets

soft iron spheres on the sides of the compass

415

Discounting slip, if your vessel is turning RPM for 10 knots and making good a speed of 10 knots, the current could be .

with you at 10 knots

against you at 10 knots

slack

with you at 2 knots

416

Distance along a track line is measured on a Mercator chart by using the .

latitude scale near the middle of the track line

longitude scale near the middle of the track line

latitude scale at the mid-latitude of the chart

latitude or longitude scale at the middle of the scale

417

Diurnal aberration is due to .

motion of the Earth in its orbit

rotation of the Earth on its axis

the body's orbital motion during the time required for its light to reach the Earth

a false horizon

418

Drawbridges equipped with radiotelephones display a .

day signal of a yellow diamond marked with the call sign

white sign with the number 16 and the call sign on it

black and white diamond marked with RT 16

blue and white sign showing the radio's channels

419

During daylight savings time the meridian used for determining the time is located farther .

west

east

east in west longitude and west in east longitude

west in west longitude and east in east longitude

420

During daylight savings time the meridian used for determining the time is located farther .

west in west longitude and east in east longitude

east in west longitude and west in east longitude

west

east

421

During one synodic rotation, a body makes one complete turn relative to the .

Earth

Sun

stars

vernal equinox

422

During the month of October the Sun's declination is .

north and increasing

north and decreasing

south and increasing

south and decreasing

423

During the winter months, the southeast trade winds are .

stronger than during the summer months

weaker than during the summer months

drier than during the summer months

wetter than during the summer months

424

Early indications of the approach of a hurricane may be all of the following EXCEPT .

short confused swells

gradually increasing white clouds (mare's tails)

pumping barometer

continuous fine mist- like rain

425

ECDIS must be able to perform all of the following EXCEPT .

determine true bearing and distance between two geographical points

determine magnetic compass deviation

transform a local datum to the WGS-'84 datum

convert "graphical coordinates" to "display coordinates"

426

ECDIS must give an alarm for which of the following cases?

If the ship is going to reach a critical point on the planned route

When the speed of a dangerous target exceeds a set limit

If the ship's ETA has changed beyond the set limit

All of the above

427

ECDIS must give an alarm for which of the following cases?

When the speed of a dangerous target exceeds a set limit

When the specified limit for deviation from the planned route is exceeded

If the ship's ETA has changed beyond the set limit

None of the above

428

ECDIS must give an alarm for which of the following cases?

When the specified limit for deviation from the planned route is exceeded

If the ship, within a specified time set by the watch officer, is going to cross a safety contour

If the ship, within a specified time set by the watch officer, is going to cross the boundary of a prohibited area

All of the above

429

ECDIS must have the capability to preserve the record of the voyage track for the previous .

4 hours

6 hours

12 hours

24 hours

430

ECDIS units incorporate Digital Chart Data Formats, which include .

vector only

raster only

vector and raster

imposed viewing

431

Eight points of a compass are equal to how many degrees?

45

90

180

360

432

Electronic Plotting Aid (EPA) has which built in functions?

Automatic target tracking

Trial maneuvering

Target CPA and time of CPA (TCPA)

Plots at least 20 targets simultaneously

433

Electronic Plotting Aid (EPA) has which built in functions?

Time of closest point of approach (TCPA)

Target trails

Plots at least 10 targets at one time

All of the above

434

Entering from sea, a daymark on the port side of the channel would be indicated on a chart by a .

red triangle with the letter R

white triangle with the letters RG

green square with the letter G

white square with the letters GR

435

Entering from seaward, triangular-shaped daymarks are used to mark .

the starboard side of the channel

the centerline of the channel

an obstruction where the preferred channel is to starboard

special purpose areas

436

Error may be introduced into a magnetic compass by .

making a structural change to the vessel

a short circuit near the compass

belt buckles

All of the above

437

Except for N-S courses, and E-W courses on the equator, a great circle track between two points, when compared to a rhumb line track between the same two points, will .

always be nearer to the equator

always be nearer to the elevated pole

be nearer to the pole in the Northern Hemisphere and nearer to the equator in the Southern Hemisphere

be nearer to the pole or the equator depending on the latitudes of the arrival and departure positions

438

Fetch is the .

distance a wave travels between formation and decay

stretch of water over which a wave- forming wind blows

time in seconds required for two crests to pass a given point

measurement of a wave's steepness

439

Find the height of the tide at Port Wentworth, GA, on 5 October 1983, at 1840 DST (ZD +4).

3.0 feet

3.5 feet

4.0 feet

4.4 feet

440

Fog forms when the air .

is 50% water saturated

is 90% water saturated

temperature is greater than the dew point temperature

temperature is equal to, or below the dew point temperature

441

Fog forms when the air temperature is at or below .

32 F

the wet bulb temperature

the dew point

the dry bulb temperature

442

Fog generally clears when the .

wind speed increases

wind direction changes

temperature increases

All of the above

443

Fog is formed when .

the moisture in the air is condensed into small droplets

air is cooled to its dew point

the base of a cloud is on the ground

All of the above

444

Fog is likely to occur when there is little difference between the dew point and the .

relative humidity

air temperature

barometric pressure

absolute humidity

445

Fog is most commonly associated with a(n) .

warm front at night

low pressure area

anticyclone

cold front in the spring

Fomalhaut is found in what constellation?

Leo

Taurus

Pisces

Canis Major

447

For 3 November 1983, at 0830 EST (ZD +5) at Catskill, NY, what is the predicted height of tide?

+0.1 foot (+0.0 m)

-0.6 foot (-0.2 m)

+0.9 foot (+0.3 m)

-1.3 feet (-0.4 m)

448

For a well made and well maintained sextant, the maximum value of which correction is usually so small that it can be ignored?

Personal correction

Instrument correction

Phase

Dip correction

449

For an accurate barometer check, you would .

check it with a barometer on another vessel

take readings from several barometers and average them

check it with the barometer at the ship chandlery

check it against radio or National Weather Service reports of the immediate vicinity

450

For navigational purposes, each great circle on the Earth has a length of .

3,600 miles

5,400 miles

12,500 miles

21,600 miles

451

Freezing salt water spray should be anticipated when the air temperature drops below what temperature?

32F (0.0C)

28F (-2.2C)

0F (-17.8C)

-40F (-28.9C)

452

From LAT 0712'N, LONG 8000'W, to LAT 4712'S, LONG 16918'E, the initial great circle course angle is 137.25. How would you name this course?

N 137.25E

S 137.25E

N 137.25W

S 137.25W

453

From which type of cloud can a tornado or waterspout develop?

Nimbostratus

Altostratus

Cumulonimbus

Cirrus

454

General information about the location, characteristics, facilities, and services for U.S. and foreign ports may be obtained from which publication?

World Port Index

Sailing Directions

Distances Between Ports

Coast Pilot

455

General information on enroute weather and climate is found in .

the Sailing Directions and the Coast Pilot

a weather fax

the Local Notice to Mariners

the Light List

456

Generally speaking, a ship steaming across the North Pacific from Japan to Seattle is likely to experience .

adverse currents for practically the entire crossing

favorable currents for practically the entire crossing

favorable currents in the summer months and adverse currents in the winter months

variable currents having no significant effect on the total steaming time

457

Generally speaking, in the Northern Hemisphere, when winds are blowing from between SE and SW the barometric reading .

makes no change at all

is somewhat lower than it would be for winds from a northern quadrant

is uncertain and may fluctuate by increasing and decreasing

is somewhat higher than it would be for winds from the northern quadrant

458

Generally speaking, you should expect to find low atmospheric pressure prevailing in the earth's .

equatorial area

polar regions

mid-latitudes

All of the above

459

Geographic range is the maximum distance at which a light may be seen under .

existing visibility conditions, limited only by the curvature of the Earth

perfect visibility conditions, limited only by the curvature of the Earth

existing visibility conditions, limited only by the intensity of the light

perfect visibility conditions, limited only by interference from background lighting

460

Given are the courses and speeds of 4 vessels. The navigator of which vessel would be required to know the actual time of meridian transit in order to take an accurate observation at LAN ?

C 018T, Sp 6 knots

C 079T, Sp 24 knots

C 101T, Sp 7 knots

C 349T, Sp 25 knots

461

Given are the courses and speeds of 4 vessels. The navigator of which vessel would be required to know the actual time of meridian transit in order to take an accurate observation at LAN?

C 356T, Sp 5.5 knots

C 162T, Sp 27 knots

C 095T, Sp 30 knots

C 268T, Sp 22 knots

462

Given are the courses and speeds of 4 vessels. The navigator of which vessel would be required to know the actual time of meridian transit in order to take an accurate observation at LAN?

C 356T, Sp 5 knots

C 099T, Sp 17 knots

C 192T, Sp 23 knots

C 278T, Sp 6 knots

463

Given are the courses and speeds of 4 vessels. The navigator of which vessel would be required to know the actual time of meridian transit in order to take an accurate observation at LAN?

C 166T, Sp 24 knots

C 013T, Sp 7 knots

C 291T, Sp 25 knots

C 112T, Sp 4 knots

464

Good weather is usually associated with a region of .

low barometric pressure

high barometric pressure

falling barometric pressure

pumping barometric pressure

465

Green lights may appear on .

horizontally banded buoys

vertically striped buoys

yellow buoys

spherical buoys

466

Gyrocompass repeaters reproduce the indications of the master gyrocompass. They are .

accurate only in the Polar regions

accurate electronic servomechanisms

hand operated

accurate only if the vessel is underway

467

Heeling error is defined as the change of deviation for a heel of .

2While the vessel is on an intercardinal heading

1While the vessel is on a compass heading of 000

2 and is constant on all headings

1 while the vessel is on a compass heading of 180

468

High clouds, composed of small white flakes or scaly globular masses, and often banded together to form a "mackerel sky", would be classified as .

cirrus

cirrocumulus

altostratus

cumulonimbus

469

Hot air can hold .

less moisture than cold air

more moisture than cold air

the same amount of moisture as cold air

moisture independent of air temperature

470

How can you estimate the position of a tropical storm's center?

With a radio weather bulletin or weather fax

using shipboard radar

observe the wind direction and apply Buys Ballot's law

All of the above

471

How is a navigation light identified on an Army Corps of Engineers navigation map?

Name and light characteristic

Name and miles from a reference point

Light characteristic and miles A.H.P.

None of the above

472

How is a safe water mark, that can be passed close aboard on either side, painted and lighted?

Black and white stripes with an interrupted quick flashing light

Black and red stripes with a Morse (A) light

Black and red stripes with an interrupted quick flashing light

Red and white stripes with a Morse (A) light

473

How is the annual rate of change for magnetic variation shown on a pilot chart?

Gray lines on the uppermost inset chart

Red lines on the main body of the chart

In parenthesis on the lines of equal magnetic variation

Annual rate of change is not shown.

474

How is the intensity of a light expressed in the Light Lists?

Luminous range

Geographic range

Nominal range

Meteorological range

475

How is variation indicated on a small-scale nautical chart?

Magnetic compass table

Magnetic meridians

Isogonic lines

Variation is not indicated on small- scale nautical charts.

476

How long would a steady wind need to blow in order to create a wind driven current?

2 hours

6 hours

12 hours

18 hours

477

How many fixed objects are needed to plot a running fix?

None

One

Two

Three

478

How many high waters usually occur each day on the East Coast of the United States?

One

Two

Three

Four

How many points are there in a compass card?

4

8

24

32

480

How many slack tidal currents usually occur each day on the east coast of the United States?

One

Two

Three

Four

481

How many targets can an Electronic Plotting Aid (EPA) track at the same time?

20

10

5

2

482

Hurricanes may move in any direction. However, it is rare and generally of short duration when a hurricane in the Northern Hemisphere moves toward the .

west or northwest

northeast

southeast

north

483

If a chart indicates the depth of water to be 6 fathoms and your draft is 6.0 feet, what is the depth of the water under your keel? (Assume the actual depth and charted depth to be the same)

6.0 feet

26.5 feet

30.0 feet

56.5 feet

484

If a hurricane several hundred miles away is moving in your general direction your barometer would .

start to rise rapidly

start to fall gradually

rise slowly, begin "pumping" and then start a slow, steady fall

remain steady

485

If a magnetic compass is not affected by any magnetic field other than the Earth's, which statement is TRUE?

Compass error and variation are equal.

Compass north will be true north.

Variation will equal deviation.

There will be no compass error.

486

If a ship is proceeding towards the magnetic equator, the uncorrected deviation due to permanent magnetism .

increases

remains the same

decreases

is unimportant and may be neglected

487

If a sound signal is emitted from the oscillator of a fathometer, and two seconds elapse before the returning signal is picked up, what depth of water is indicated?

1648 fathoms

1248 fathoms

1048 fathoms

824 fathoms

488

If a towboat requires a double lockage it shall give which sound signal at a distance of not more than one mile from the lock?

One short blast followed by two long blasts

One long blast followed by one short blast

Two long blasts followed by one short blast

One long blast followed by two short blasts

489

If a weather bulletin shows the center of a low pressure system to be 100 miles due east of you, what winds can you expect in the Southern Hemisphere?

South-southwesterly

North-northwesterly

South-southeasterly

North-northeasterly

490

If an observer in the Northern Hemisphere faces the surface wind, the center of low pressure is to his .

left, slightly behind him

right, slightly behind him

left, slightly in front of him

right, slightly in front of him

491

If an observer is at 35N latitude, his zenith is .

55S of the celestial equator

at the north celestial pole

35N of the celestial equator

55N of the celestial equator

492

If it is impossible to avoid a hurricane in the Northern Hemisphere, the most favorable place to be when the storm passes is in .

the dangerous semicircle

the eye (center) of the storm

that half of the storm lying to the right of the storm's path

that half of the storm lying to the left of the storm's path

493

If several navigational lights are visible at the same time, each one may be positively identified by checking all of the following EXCEPT what against the Light List?

Rhythm

Period

Intensity

Color

494

If the compass heading and the magnetic heading are the same then .

the deviation has been offset by the variation

there is something wrong with the compass

the compass is being influenced by nearby metals

there is no deviation on that heading

495

If the current and wind are in opposite directions, the sea surface represents .

a greatly reduced wind speed

a higher wind speed than what really exists

a lower wind speed than what really exists

more turbulent winds

496

If the current and wind are in the same direction, the sea surface represents a wind speed .

lower than actually exists

higher than actually exists

that actually exists

that has no proportional relationship

497

If the electronic chart is part of an ECDIS, it must display the minimum data required by IMO/IHO, to include all of the following EXCEPT .

hydrography

aids to navigation

tidal currents

regulatory boundaries

498

If the GMT is 1500, the time at 75E longitude is .

1000

1500

1700

2000

499

If the gyrocompass error is east, what describes the error and the correction to be made to gyrocompass headings to obtain true headings?

The readings are too low (small numerically) and the amount of the error must be added to the compass to obtain true

The readings are too low and the amount of the error must be subtracted from the compass to obtain true

The readings are too high (large numerically) and the amount of the error must be added to the compass to obtain true

The readings are too high and the amount of the error must be subtracted from the compass to obtain true

500

If the magnetic heading is greater than the compass heading, the deviation is .

east

west

north

south

501

If the main channel under a bridge is marked with lights of the lateral system the adjacent bridge piers should be marked with .

occulting white lights

fixed yellow lights

fixed white lights

flashing yellow lights

502

If the right ascension of a body is 9 hours, it also .

is 135

corresponds to an SHA for the body of 45

means that the GP of the body is in the western hemisphere

All of the above

503

If the sky was clear, with the exception of a few cumulus clouds, it would indicate .

rain

hurricane weather

fair weather

fog setting in

504

If the Sun's observed altitude is 2712', the zenith distance is .

6248'

2712'

15248'

4312'

505

If the Sun's observed altitude is 4750', the zenith distance is .

4210'

4250'

4750'

13210'

506

If the Sun's observed altitude is 5430', what is the zenith distance?

3530'

4530'

1230'

1430'

507

If there is any doubt as to the proper operation of a radar, which statement is TRUE?

Only a radar expert can determine if the radar is operating.

All radars have indicator lights and alarms to signal improper operation.

A radar range compared to the actual range of a known object can be used to check the operation of the radar.

The radar resolution detector must be energized to check the radar.

508

If within 500 yards (460m) of a Northern Right Whale you are lawfully obligated to .

turn away from the whale and leave at full speed

turn away from the whale and leave at slow speed

slow to bare steerageway until the whale swims away

stop the vessel and sound repeated blasts on the ship's whistle to scare the whale away

509

If you are caught in the left semicircle of a tropical storm, in the Southern Hemisphere, you should bring the wind .

on the starboard quarter, hold course and make as much way as possible

2 points on the port quarter, and make as much way as possible

on the port bow, and make as much way as possible

dead ahead and heave to

510

If you are sailing from the East Coast of the United States to the Caribbean Sea, which publication would contain information on weather, currents, and storms?

Sailing Charts of the Caribbean Sea

Pilot Charts of the North Atlantic

Light Lists, Atlantic and Gulf Coast

Tidal Current Tables

511

If you count 20 seconds between seeing lightning and hearing the thunder, how far is the storm away from you?

2 miles

4 miles

6 miles

8 miles

512

If you observe a buoy off station you should .

fill out and mail CG Form 2692 to the nearest Coast Guard office

appear in person at the nearest Coast Guard office

notify Coast Guard Headquarters in Washington, DC

immediately contact the nearest Coast Guard office by radiotelephone

513

If you observe a rapid fall of barometric pressure you should .

call the Coast Guard to verify the change

know the barometer is not working properly

contact the NWS or a local radio station

prepare for the onset of stormy weather with strong winds

514

If you were sailing in the North Pacific and were interested in the ice and iceberg limits, you could find this information in the .

Pilot Chart

Coast Pilot

Notice to Mariners

None of the above

515

If your mercurial barometer reads 30.50 inches (1033 millibars) and the temperature is 56F (13C), what is the correct reading at 55N, 150W?

30.42 inches (1030 millibars)

30.45 inches (1031 millibars)

30.50 inches (1032 millibars)

30.53 inches (1033 millibars)

516

If your vessel must pass through a draw during a scheduled closure period, what signal should you sound to request the opening of the draw?

One prolonged blast followed by one short blast

Three short blasts

One prolonged blast followed by three short blasts

Five short blasts

517

If your vessel were proceeding down river (descending), a green square marker with a green reflector border on the right bank would be a .

mile board

dredging mark

passing daymark

crossing daymark

518

If your vessel were proceeding up river (ascending), the port side of the channel would be marked according to the U. S. Aids to Navigation System on the Western Rivers by .

green can buoys

red can buoys

green nun buoys

red nun buoys

519

If your weather bulletin shows the center of a low pressure area to be 100 miles due east of your position, what winds can you expect in the Northern Hemisphere?

East to northeast

East to southeast

North to northwest

South to southeast

520

In a cyclone the lowest pressure is found in the .

center

outer edge

warm front

cold front

521

In a microbarograph, the pen should be checked and the inkwell filled .

each time the chart is changed

once per month

once per week

daily

522

In a river subject to tidal currents, the best time to dock a ship without the assistance of tugs is .

at slack water

at flood tide

when there is a following current

at high water

523

In a tropical cyclone in the Northern Hemisphere, a vessel hove to with the wind shifting counterclockwise would be .

in the navigable semicircle

in the dangerous semicircle

directly in the path of the center

ahead of the storm

524

In a tropical cyclone, in the Northern Hemisphere, a vessel hove to with the wind shifting counterclockwise is .

ahead of the storm center

in the dangerous semicircle

in the navigable semicircle

directly in the approach path of the storm

525

In a weather report, the term "visibility" expresses .

how far you can see with the "naked eye"

how far you can see with a telescope or binoculars

how well you can identify an object at night

the distance in miles at which prominent objects are identifiable

526

In addition to monitoring channel 16, all Corps of Engineer locks may use as working channels .

06, 12 and 22A

01A, 05A and 07A

12, 13 and 14

14, 24 and 28

527

In addition to the National Weather Service, what agency provides plain-language radio weather advisories for the coastal waters of the United States?

National Geospatial- Intelligence Agency

U.S. Hydrological Survey

U.S. Coast Guard

American Meteorological Service

528

In both regions of the IALA buoyage system, which topmark is used on a special mark?

A

B

C

D

D022NG

529

In general, on how many radio channels will an automatic identification system (AIS) operate?

2

4

6

8

530

In general, the most effective period for observing stars and planets occurs during the darker limit of .

sunset

civil twilight

nautical twilight

astronomical twilight

531

In high latitudes, celestial observations can be made over a horizon covered with pack ice by bringing the sun tangent to the ice and .

adding 30 of arc to the sight

using a dip correction based on the height of eye above the ice

doubling the semidiameter correction

using a dip correction from table 22 in Bowditch Vol. II

532

In low latitudes the range of the diurnal variation of pressure is up to .

0.5 millibar

3.0 millibars

6.0 millibars

10.0 millibars

533

In low latitudes, a first quarter Moon will always rise at about .

sunrise

1200 LMT

sunset

2400 LMT

534

In low latitudes, a last quarter moon will always rise at about .

sunrise

1200 LMT

sunset

2400 LMT

535

In low latitudes, the full Moon will always rise at about .

sunrise

1200 LMT

sunset

2400 LMT

536

In low latitudes, the high(s) of the diurnal variation of pressure occur(s) at .

noon

noon and midnight

1000 and 2200

1600

537

In low latitudes, the low(s) of the diurnal variation of pressure occur(s) at .

noon

noon and midnight

1000 and 2200

0400 and 1600

538

In low latitudes, the new Moon will always rise at about .

sunrise

1200 LMT

sunset

2400 LMT

539

In many areas "atoll" clouds (clouds of vertical development) are produced over small islands. These are the result of .

rising air currents produced by the warm islands

warm air from the sea rising over higher land areas

cool land air mixing with warm sea air

descending air over the islands

540

In mid-ocean, the characteristics of a wave are determined by three factors. What is NOT one of these factors?

Effect of the moon's gravity

Fetch

Wind velocity

Length of time a wind has been blowing

541

In modern fathometers the sonic or ultrasonic sound waves are produced electrically by means of a(n) .

transmitter

transducer

transceiver

amplifier

542

In most cases, the direction of the apparent wind lies between the bow and .

the direction of the true wind

true north

the beam on the windward side

the beam on the lee side

543

In North America the majority of the weather systems move from .

north to south

south to north

east to west

west to east

544

In order for a star to be used for a sight at lower transit, the star must .

be circumpolar

have a declination equal to or greater than your latitude

have a GHA of 180

have the SHA equal to or less than the LHA

545

In order to get the maximum benefit from the Gulf Stream, on a voyage between Houston and Philadelphia, you should navigate .

about 75 miles east of Ormond Beach, FL

close inshore between Jupiter Inlet and Fowey Rocks, FL

along the 50-fathom curve while off the east coast of Florida

about 10 miles east of Cape Canaveral, FL

546

In order to insure that a RACON signal is displayed on the radar, you should .

increase the brilliance of the PPI scope

turn off the interference controls on the radar

use the maximum available range setting

increase the radar signal output

547

In order to insure that the racon signal is visible on your 3 cm radar, the .

10 cm radar should be placed on standby or turned off

gain control should be turned to maximum

radar should be stabilized, head up

rain clutter control should be off but, if necessary, may be on low

548

In order to remove index error from a sextant, you should adjust the .

index mirror to make it parallel to the horizon glass with the index set at zero

horizon glass to make it parallel to the index mirror with the index set at zero

horizon glass to make it parallel to the sextant frame

telescope to make it perpendicular to the sextant frame

549

In order to remove side error from a sextant, you should adjust the .

horizon glass to make it parallel to the horizon mirror with the index set at zero

horizon glass to make it perpendicular to the index mirror with the index set at zero

horizon glass to make it perpendicular to the sextant frame

telescope to make it parallel to the sextant frame

550

In order to utilize the capacity of a lock to its maximum, pleasure craft are locked through with all of the following EXCEPT .

coal barges

oil barges

sand barges

cement barges

551

In reading a weather map, closely spaced pressure gradient lines would indicate .

high winds

high overcast clouds

calm or light winds

fog or steady rain

552

In Region A of the IALA Buoyage System, when entering from seaward, the port side of a channel would be marked by a .

black can buoy

red can buoy

black conical buoy

red conical buoy

553

IN REGION A of the IALA Buoyage System, when entering from seaward, the starboard side of a channel would be marked by a .

red can buoy

red conical buoy

green can buoy

green conical buoy

554

In regions near the poles, the winds are generally described as .

westerlies

easterlies

northerlies

southerlies

555

In shallow water, waves that are too steep to be stable, causing the crests to move forward faster than the rest of the wave, are called .

rollers

breakers

white caps

surfers

556

In some parts of the world there is often a slight fall in tide during the middle of the high water period. The effect is to create a longer period of stand at higher water. This special feature is called a(n) .

apogean tide

double high water

perigean tide

bore

557

In some river mouths and estuaries the incoming high- tide wave crest overtakes the preceding low-tide trough. This results in a wall of water proceeding upstream, and is called a .

seiche

bore

boundary wave

surge

558

In the Bay of Fundy, during twilight, you a take sight of Mars. The sextant altitude (hs) is 0335.5'. Your height of eye is 32 feet and there is no index error. The air temperature is -10C and the barometer reads 1010 millibars. What is the observed altitude (Ho)?

0314.5'

0315.8'

0316.2'

0328.8'

559

In the celestial equator system of coordinates what is equivalent to the colatitude of the Earth system of coordinates?

Coaltitude

Zenith distance

Polar distance

Declination

560

In the celestial equator system of coordinates what is equivalent to the longitude of the Earth system of coordinates?

Zenith distance

Azimuth angle

Declination

Greenwich hour angle

561

In the celestial equator system of coordinates what is NOT equivalent to the longitude of the Earth system of coordinates?

SHA

t

LHA

Zn

562

In the celestial equator system of coordinates what is the equivalent to the meridians of the Earth system of coordinates?

Horizon

Hour circles

Vertical circles

Parallel of declination

563

In the celestial equator system of coordinates, what is comparable to latitude on the terrestrial sphere?

Altitude

Right ascension

Celestial meridians

Declination

564

In the doldrums you can expect .

steady, constant winds

frequent rain showers and thunderstorms

steep pressure gradients

low relative humidity

565

In the doldrums you will NOT have .

high relative humidity

frequent showers and thunderstorms

steep pressure gradients

frequent calms

566

In the horizon system of coordinates what is equivalent to latitude on the Earth?

Altitude

Zenith

Declination

Zenith distance

567

In the horizon system of coordinates what is equivalent to longitude on the Earth?

Altitude

Azimuth angle

Horizon

Zenith distance

568

In the horizon system of coordinates what is equivalent to the declination of the equator system?

Nadir

Azimuth angle

Altitude

Zenith distance

569

In the horizon system of coordinates what is equivalent to the equator on the Earth?

Prime vertical circle

Principal vertical circle

Parallels of altitude

Horizon

570

In the horizon system of coordinates what is equivalent to the Greenwich hour angle of the celestial equator system?

Zenith distance

Coaltitude

Altitude

Azimuth

571

In the horizon system of coordinates what is equivalent to the local hour angle of the celestial equator system?

Altitude

Azimuth

Zenith distance

Colongitude

572

In the horizon system of coordinates what is equivalent to the meridian angle of the celestial equator system?

Azimuth angle

Zenith distance

Colatitude

Altitude

573

In the horizon system of coordinates what is equivalent to the parallels of declination of the celestial equator system?

Vertical circles

Parallels of altitude

Zenith distance

Azimuth angle

574

In the horizon system of coordinates what is equivalent to the poles on the Earth?

Celestial poles

Zenith, nadir

Ecliptic poles

Nodes

575

In the horizon system of coordinates what is the equivalent to the celestial equator of the celestial equator system?

Horizon

Prime vertical circle

Prime meridian

Principal vertical circle

576

In the horizon system of coordinates what is the equivalent to the meridians on the Earth?

Horizon

Hour circle

Vertical circles

Celestial meridians

577

In the IALA Buoyage System, buoys with alternating red and green horizontal bands are used to indicate .

fishing areas

spoil grounds

the preferred channel

isolated dangers

578

In the IALA Buoyage System, preferred-channel-to- port or preferred-channel-to-starboard buoys, when fitted with lights, will show a .

quick flashing light

long flashing light

composite group flashing (2 + 1) light

group flashing

579

In the IALA Maritime Buoyage System, a red and white vertically-striped buoy is used as a(n) .

safe water mark

cardinal mark

isolated danger mark

special mark not primarily used for navigation

580

In the Nautical Almanac provided, when would Jupiter and Saturn be visible in temperate latitudes for both evening and morning stars?

10 January

27 March

22 June

8 October

581

In the navigational triangle, the angle at the elevated pole is the .

meridian angle

altitude

right ascension

azimuth angle

582

In the North Sea area, you sight a buoy showing a quick white light showing 6 flashes followed by one long flash at 15 second intervals. Which of the four topmarks illustrated in diagram D031NG would be fitted to this buoy?

A

B

C

D

D031NG

583

In the North Sea area, you sight a buoy showing a quick white light with 6 flashes, followed by one long flash at 15 second intervals. Which of the four topmarks shown would be fitted to this buoy?

A

B

C

D

D030NG

584

In the North Sea area, you sight a buoy showing a quick white light with 9 flashes every 15 seconds. Which of the four topmarks shown would be fitted to the buoy?

A

B

C

D

D030NG

585

In the North Sea area, you sight a buoy showing a quick white light with 9 flashes every 15 seconds. Which of the four topmarks shown would be fitted to the buoy?

A

B

C

D

D031NG

586

In the North Sea area, you sight a buoy showing an uninterrupted quick-flashing white light. Which of the four topmarks shown will this buoy be fitted with under the IALA Buoyage system?

A

B

C

D

D031NG

587

In the North Sea area, you sight a buoy with a quick light showing 3 flashes every 10 seconds. Which topmark in illustration D030NG would be fitted to this buoy under the IALA Buoyage Systems?

A

B

C

D

D030NG

588

In the Northern Hemisphere a wind is said to veer when the wind .

changes direction clockwise, as from north to east, etc.

changes direction violently and erratically

remains constant in direction and speed

changes direction counterclockwise, as from south to east, etc.

589

In the Northern Hemisphere the major ocean currents tend to flow .

clockwise around the North Atlantic and North Pacific Oceans

clockwise or counterclockwise depending on whether it is warm or cold current

counterclockwise except in the Gulf Stream

counterclockwise around the North Atlantic and North Pacific Oceans

590

In the Northern hemisphere which semicircle of a hurricane is the navigable semicircle?

Left

Right

Front

Back

591

In the Northern Hemisphere you are caught in the dangerous semicircle of a storm with plenty of sea room available. The best course of action is to bring the wind on the .

port quarter and make as much headway as possible

starboard quarter and make as much headway as possible

starboard bow and make as much headway as possible

port bow and make as much headway as possible

592

In the Northern Hemisphere, if your vessel is in a hurricane's navigable semicircle it should be positioned with the wind on the .

starboard quarter, hold course and make as much speed as possible

port bow, hold course and make as much speed as possible until the hurricane has passed

port quarter, maintain course and make as much speed as possible

starboard bow and heave to until the hurricane has passed

593

In the Northern Hemisphere, a wind that shifts counterclockwise is a .

veering wind

backing wind

reverse wind

chinook wind

594

In the Northern Hemisphere, an area of counterclockwise wind circulation surrounded by higher pressure is a .

low

high

warm front

cold front

595

In the Northern Hemisphere, an observer at point II in the weather system should experience a wind shift from the .

southwest, clockwise to northwest

northeast, clockwise to west-southwest

northeast, counterclockwise to northwest

east, counterclockwise to south-southwest

D014NG

596

In the Northern Hemisphere, gusty winds shifting clockwise, a rapid drop in temperature, thunderstorms or rain squalls in summer (frequent rain/snow squalls in winter) then a rise in pressure followed by clearing skies, indicate the passage of a(n) .

warm front

tropical cyclone

anticyclone

cold front

597

In the Northern Hemisphere, the largest waves or swells created by a typhoon or hurricane will be located .

in the southeast quadrant of the storm

directly behind the storm center

forward and to the right of its course

behind and to the left of its course

598

In the Northern Hemisphere, the right half of the storm is known as the dangerous semicircle because .

The wind speed is greater here since the wind is traveling in the same general direction as the storm's track

the direction of the wind and seas might carry a vessel into the path of the storm

the seas are higher because of greater wind speed

All of the above

599

In the Northern Hemisphere, what type of cloud formations would you expect to see to the west of an approaching tropical wave?

Cumulus clouds lined up in rows extending in a northeast to southwest direction

High altostratus clouds in the morning hours

Cirrostratus clouds lined up in rows extending in a northeast to southwest direction

Cirrostratus clouds lined up in rows extending in a north to south direction

600

In the Northern Hemisphere, when the center of a high pressure system is due east of your position, you can expect winds from the .

south to west

south to east

north to west

north to east

601

In the Northern Hemisphere, winds veering sharply to the west or northwest with increasing speed are indications that a .

cold front has passed

low pressure center is approaching

stationary front exists

high pressure center has passed

602

In the Northern Hemisphere, your vessel is believed to be in the direct path of a hurricane, and plenty of sea room is available. The best course of action is to bring the wind on the .

starboard bow, note the course, and head in that direction

starboard quarter, note the course, and head in that direction

port quarter, note the course, and head in that direction

port bow, note the course, and head in that direction

603

In the relatively calm area near the hurricane center, the seas are .

moderate but easily navigated

calm

mountainous and confused

mountainous but fairly regular as far as direction is concerned

604

In the Sargasso Sea there are large quantities of seaweed and no well defined currents. This area is located in the .

Central North Atlantic Ocean

Caribbean Sea

Western North Pacific Ocean

area off the west coast of South America

605

In the Southern Hemisphere the wind circulation in a high pressure system rotates .

clockwise and inward

clockwise and outward

counterclockwise and outward

counterclockwise and inward

606

In the Southern Hemisphere winds in a low pressure system rotate in a .

clockwise direction

northeasterly direction

northerly direction

counterclockwise direction

607

In the U.S. Aids to Navigation System on the Western Rivers, a preferred channel buoy to be left to port while proceeding downstream will .

have the upper band red

show a red light if lighted

have a characteristic of composite group flashing if lighted

All of the above

608

In the U.S. Aids to Navigation System on the Western Rivers, the light characteristic of group flashing (2) is used for lights on .

the right descending bank

the left descending bank

preferred channel buoys

daymarks with no lateral significant

609

In the U.S. Aids to Navigation System, lateral aids as seen entering from seaward will display lights with which characteristic?

Flashing

Occulting

Quick Flashing

All of the above

610

In the U.S. Aids to Navigation System, red and green horizontally-banded buoys mark .

channels for shallow draft vessels

general anchorage areas

fishing grounds

junctions or bifurcations

611

In the United States, short-range radio navigational warnings are broadcast by the .

Coast Guard

Corps of Engineers

NOAA

harbor master of the nearest port

612

In United States waters, a buoy having red and white vertical stripes has a light characteristic of .

group occulting

Morse (A)

interrupted quick flashing

quick flashing

613

In very high latitudes, the most practical chart projection is the .

Mercator

gnomonic

azimuthal

Lambert conformal

614

In waters where the cardinal system is used you would expect to find danger .

lying to the south of an eastern quadrant buoy

lying to the south of a northern quadrant buoy

lying to the east of an eastern quadrant buoy

beneath or directly adjacent to the buoy

615

In what order should the following sextant adjustments be made? I. Make telescope parallel to frame of sextant. II. Set horizon glass perpendicular to frame of sextant. III. Make index mirror and horizon glass parallel when index arm is set at zero. IV. Set index mirror perpendicular to frame of sextant.

I, II, III, IV

I, IV, II, III

III, II, IV, I

IV, II, III, I

616

In which country would you expect the channels to be marked with the IALA-B Buoyage System?

Brazil

Tanzania

New Zealand

Norway

617

In which country would you expect the channels to be marked with the IALA-B Buoyage System?

Poland

Morocco

Peru

Saudi Arabia

618

In which month will the equatorial counter current be strongest?

January

April

August

October

619

In which publication could you find information concerning the minimum lighting required for bridges on U.S. waters?

Chart No. 1.

Code of Federal Regulations

Mississippi River Systems Light List

Notice to Mariners

620

In which source could you find the number of a chart for a certain geographic area?

Chart No. 1

Catalog of Charts

American Practical Navigator

U.S. Coast Guard Light List

621

In which source could you find the vertical clearance of a bridge on the Ohio River?

Notice to Mariners

Light List of the Mississippi River System

Great Lakes Pilot

Coast Pilot of the Gulf of Mexico

622

In which voyage, between two points, is the rhumb line distance NOT approximately the same as the great circle distance?

The two points are in low latitudes in the same hemisphere.

The two points are in high latitudes in the same hemisphere.

The two points are near the equator, but in different hemispheres.

One point is near the equator, one point is in a high latitude, and both are near the 180th meridian.

623

In working out a local apparent noon sight for your latitude, you subtract the Ho from 90. The 90 represents the angular distance from .

the equator to the elevated pole

your horizon to your zenith

your zenith to the elevated pole

the geographical position of the Sun to the elevated pole

624

Index error of a sextant is primarily caused by .

improperly correcting the other errors in a sextant

the horizon glass not being parallel to the horizon mirror

the horizon glass not being parallel to the index mirror

human error in taking a celestial observation

625

Indications of the master gyrocompass are sent to remote repeaters by the .

follow-up system

transmitter

phantom element

azimuth motor

Induced magnetism is found in .

hard iron

soft iron

vertical iron only

horizontal iron only

Inferior conjunction is possible for .

Mars

Venus

Saturn

Jupiter

628

Information about currents around Pacific Coast ports of the U.S. is found in the .

Nautical Almanac

Tide Tables

Tidal Current Tables

Ocean Current Tables

629

Information about currents on the Pacific Coast of the U. S. are found in the .

Tidal Current Tables

Nautical Almanac

Tide Tables

Ocean Current Tables

630

Information about currents on the Pacific Coast of the U. S. is found in the .

Nautical Almanac

Tidal Current Tables

Ocean Current Tables

Tide Tables

631

Information about direction and velocity of rotary tidal currents is found in the .

Tide Tables

Nautical Almanac

Tidal Current Tables

Mariner's Guide

632

Information about major breakdowns, repairs, or other emergency operations with regard to weirs and (or) wicket dams, on the western rivers, may be obtained by consulting the .

U.S. Coast Pilot

Broadcast Notice to Mariners

Sailing Directions

Light List Vol. V

633

Information about temporary, short term changes affecting the safety of navigation in U.S. waters is distributed to navigational interests by the .

Daily Memorandum

HYDROLANT or HYDROPAC broadcasts

Local Notice to Mariners

Summary of Corrections

634

Information about the currents for the Pacific Coast of the U. S. are found in the .

Ocean Current Tables

Nautical Almanac

Tide Tables

Tidal Current Tables

635

Information about the direction and velocity of rotary tidal currents is found in the .

Tidal Current Tables

Mariner's Guide

Tide Tables

Nautical Almanac

636

Information about the direction and velocity of rotary tidal currents is found in the .

Mariner's Guide

Tidal Current Tables

Nautical Almanac

Tide Tables

637

Information about the direction and velocity of rotary tidal currents is found in the .

Mariner's Guide

Nautical Almanac

Tide Tables

Tidal Current Tables

638

Information about the pilotage available at Miami harbor may best be obtained from which publication?

World Port Index

Sailing Directions

Pilot Chart

United States Coast Pilot

639

Information for updating nautical charts is primarily found in the .

Notice to Mariners

Coast Pilots

nautical chart catalogs

Sailing Directions

640

Information markers, when lighted, will display .

yellow lights

green lights

white lights

red lights

641

Information on northern right whales can be found in .

the Coast Pilot

HO 229

the Nautical Almanac

Ship's Medicine Chest and Medical Aid at Sea

642

Information on search and rescue procedures and special, local communications used in Mexican waters will be found in the .

World Port Index

International Code of Signals (Pub 102)

Sailing Directions (Planning Guides)

International Aeronautical and Maritime Search and Rescue Manual

643

Isobars on a weather map are useful in predicting .

temperature

dew point

wind velocity

relative humidity

644

Isogonic lines are lines on a chart indicating .

points of equal variation

points of zero variation

the magnetic latitude

magnetic dip

645

It is 1200 local time for an observer at 54E longitude. Which statement is TRUE?

It is afternoon at Greenwich.

It is midnight at 126E longitude.

The observer is in time zone -4.

All of the above are true.

646

It is desirable that a vessel encountering hurricane or typhoon conditions sends weather reports to the closest meteorological service at least every .

hour

3 hours

6 hours

8 hours

647

It is unlawful to approach within how many yards of a northern right whale?

200

300

400

500

648

Light Lists for coastal waters are .

published every year and require no corrections

published every second year and must be corrected

published every five years and require no correction

accurate thru NM number on title page and must be corrected

Lighted information markers show .

white lights

green lights

yellow lights

red lights

650

Lighted white and orange buoys must show which color light?

Orange

White

Red

Alternating yellow and white

651

Lines drawn through points on the Earth having the same atmospheric pressure are known as .

isothermal

millibars

isobars

seismics

Lines of position may be .

hyperbolas

straight lines

arcs

All of the above

653

Lines on a chart which connect points of equal magnetic variation are called .

magnetic latitudes

magnetic declinations

dip

isogonic lines

654

Little or no change in the barometric reading over a twelve hour period indicates .

stormy weather is imminent

that present weather conditions will continue

a defect in the barometer

increasing wind strength

655

Local sidereal time is equal to the .

GHA of Aries minus 180

SHA of Aries

LHA of Aries

right ascension of Aries plus 180

656

Low pressure disturbances, which travel along the intertropical convergence zone, are called .

permanent waves

tidal waves

tropical waves

tropical storms

657

Luminous range is the .

maximum distance at which a light may be seen in clear weather

maximum distance at which a light may be seen under existing visibility conditions

maximum distance at which a light may be seen considering the height of the light and the height of the observer

average distance of visibility of the light

658

Magnetic compass deviation .

varies depending upon the bearing used

is the angular difference between magnetic north and compass north

is published on the compass rose on most nautical charts

is the angular difference between geographic and magnetic meridians

659

Magnetic dip is a measurement of the angle between the .

geographic pole and the magnetic pole

lubber's line and true north

horizontal and the magnetic line of force

compass heading and the magnetic heading

660

Magnetic information on a chart may be .

found in the center(s) of the compass rose(s)

indicated by isogonic lines

found in a note on the chart

All of the above

661

Magnetic variation changes with a change in .

the vessel's heading

sea conditions

seasons

the vessel's position

662

Magnetism which is present only when the material is under the influence of an external field is called .

permanent magnetism

induced magnetism

residual magnetism

terrestrial magnetism

663

Magnets are placed in horizontal trays in the compass binnacle to compensate for the .

induced magnetism in the vessel's horizontal soft iron

change in the magnetic field when the vessel inclines from vertical

permanent magnetism of the vessel

magnetic fields caused by electrical currents in the vicinity

664

Magnets in the binnacles of magnetic compasses are used to reduce the effect of .

deviation

variation

local attraction

All of the above

665

Mariners are FIRST warned of serious defects or important changes to aids to navigation by means of .

marine broadcast Notice to Mariners

Weekly Notices to Mariners

corrected editions of charts

Light Lists

666

Mars is only seen at two phases, one of which .

is the full phase

is conjunction

occurs only at sunset or sunrise

occurs at or near 0 elongation

667

Mars will not be visible .

at elongation angles near 180

from quadrature to opposition

at conjunction

at opposition

668

Mean high water is the average height of .

the higher high waters

the lower high waters

the lower of the two daily tides

all high waters

669

Mean high water is the reference datum used to measure .

soundings on the east coast of the United States

soundings in European waters

heights of topographical features in the United States

both heights and soundings worldwide

670

Mean high water is the reference plane used for .

all vertical measurements

heights above water of land features such as lights

soundings on the East and West Coasts

water depths on the East Coast only

671

Mean high water is used .

as the reference for soundings on the Gulf coast of the U.S.

to indicate the shoreline where there is a large tidal fluctuation

as the reference plane for bottom contour lines

as the sounding datum for rivers, lakes, etc. regulated by locks

672

Mean low water is the average height of .

the surface of the sea

high waters and low waters

all low waters

the lower of the two daily low tides

673

Mean lower low water is the reference plane used for .

all vertical measurements

heights above water for lights, mountains, etc.

soundings on the U.S. east and west coasts

water depths on the U.S. east coast only

674

Mechanical lifting of air by the upslope slant of the terrain is called .

vertical lifting

convective lifting

advective lifting

topographic lifting

Miaplacidus is found in what constellation?

Puppis

Hydrus

Centaurus

Carina

676

Monsoons are characterized by .

light, variable winds with little or no humidity

strong, gusty winds that blow from the same general direction all year

steady winds that reverse direction semiannually

strong, cyclonic winds that change direction to conform to the passage of an extreme low pressure system

677

Most GPS receivers use the Doppler shift of the carrier phase to compute .

Latitude

Longitude

Speed

Time

678

Most high pressure areas in the United States are accompanied by .

precipitation

clear, cool weather

humid, sticky weather

cool fogs

679

Navigation charts of the Upper Mississippi River are published by .

National Ocean Service

Lake Survey

Corps of Engineers, U.S. Army

U.S. Coast Guard

680

Navigational marks used for informational or regulatory purposes are .

solid yellow

white with orange geometric shapes

red and white vertically- striped

green and red horizontally-banded

681

Neap tides occur .

at the start of spring, when the Sun is nearly over the equator

only when the Sun and Moon are on the same sides of the Earth and are nearly in line

when the Sun and Moon are at approximately 90 to each other, as seen from the Earth

when the Sun, Moon, and Earth are nearly in line, regardless of alignment order

682

Neap tides occur only .

at a new or full Moon

when the Sun, Moon, and Earth are in line

at approximately 28- day intervals

when the Moon is at quadrature

683

Neap tides occur when the .

Moon is in its first quarter and third quarter phases

Sun and Moon are on opposite sides of the Earth

Moon's declination is maximum and opposite to that of the Sun

Sun and Moon are in conjunction

684

NGA (NIMA) charts are adopting the metric system. In order to change a charted depth in meters to feet you may use the conversion table found .

in the Light List

in Bowditch

on the chart

All of the above

685

NOAA VHF weather reports are continuously broadcast on VHF channels WX-1, WX-2 and WX-3 on a frequency of .

156.8, 157.1, 162.55 MHz

162.55, 162.00, 171.5 KHz

162.55, 162.40, 162.475 MHz

2182, 2638, 2670 KHz

686

Normal pool elevation is the height in feet of the section of river above a dam. This height is measured from .

low steel on the Huey P. Long Bridge

mean sea level

the local water table

the minimum dam control level

687

Northern right whales can be identified by .

whitish patches of skin on top of the head

"V" shaped blow easily visible from ahead or behind

no dorsal fin on the back

All of the above

688

Ocean currents are well defined and .

create large waves in the direction of the current

change direction 360 during a 24 hour period

remain fairly constant in direction and velocity throughout the year

are characterized by a light green color

689

Ocean swells originating from a typhoon can move ahead of it at speeds near .

10 knots

20 knots

30 knots

50 knots

690

Of the four light characteristics shown which one does NOT represent a safe water mark of the IALA Buoyage System?

A

B

C

D

D019NG

691

Off Barnegat, NJ, with the wind coming out of the east, the wind-driven current will be flowing approximately .

286

254

106

016

692

Off Barnegat, NJ, with the wind coming out of the east, the wind-driven current will be flowing approximately .

016

106

254

286

693

Off Fire Island, NY with winds from the southwest, the average wind-driven current flows in a direction of .

014

076

170

256

694

Off Fire Island, NY, with winds from the southwest, the average wind-driven current flows in a direction of .

256

170

076

014

695

On 10 August 1983 you will dock near Days Point, Weehawken, on the Hudson River, at 1800 DST (ZD +4). The charted depth alongside the pier is 24 feet (7.3 meters). What will be the depth of water when you dock?

23.5 feet (7.1 m)

23.9 feet (7.2 m)

24.9 feet (7.5 m)

26.3 feet (8.0 m)

696

On 16 January, you take a sight of a star. The sextant altitude (hs) is 433.0'. The temperature is - 10C, and the barometer reads 992 millibars. The height of eye is 42 feet. The index error is 1.9' off the arc. What is the observed altitude (Ho)?

410.2'

414.3'

417.0'

424.1'

697

On 2 November 1983, at 1630 EST (ZD +5), what will be the predicted height of tide at Fulton, FL?

2.8 feet (0.8 meters)

3.4 feet (1.0 meters)

4.2 feet (1.3 meters)

5.6 feet (1.7 meters)

698

On 23 March 1983, at Kingston Point, NY, what is the earliest time after 1700 EST (ZD +5) that the predicted tide will be +2.0 feet?

1730

1800

1854

2030

699

On 25 December you observe the Sun's lower limb. The sextant altitude (hs) is 406.9'. The height of eye is 47 feet and the index error is 1.6' on the arc. The temperature is 19F and the barometer reads 1030.8 millibars. What is the observed altitude (Ho)?

357.4'

401.9'

402.5'

403.4'

700

On 26 February 1983, at 1750 EST (ZD +5) what will be the predicted height of tide at New Haven (city dock), CT?

-.3 foot (-0.1 meter)

-.6 foot (-0.2 meter)

1.3 feet (0.4 meter)

1.6 feet (0.5 meter)

701

On 27 April 1983, at 1105 DST (ZD +4), what will be the predicted height of tide at Falkner Island, CT?

5.3 feet (1.6 m)

5.6 feet (1.7 m)

6.2 feet (1.9 m)

6.8 feet (2.7 m)

702

On 5 July, at 1200 zone time, you cross the 180th meridian steaming westward. What is your local time?

It is 1200, 4 July.

It is 1200, 5 July.

It is 1200, 6 July.

It is 2400, 6 July.

703

On 5 March 1983, at 0630 EST (ZD +5), what will be the predicted height of tide at Ocracoke, Ocracoke Inlet, NC?

0.1 foot

1.2 feet

1.9 feet

2.3 feet

704

On 6 July 1983, at 1520 DST (ZD +4) what will be the predicted height of tide at Newburgh, NY?

2.1 feet

1.7 feet

1.2 feet

0.6 foot

705

On 6 July 1983, at 1830 DST (ZD +4), what will be the predicted height of tide at Newburgh, NY?

3.3 feet

2.6 feet

2.4 feet

2.0 feet

706

On 6 July, at 1000 zone time, you cross the 180th meridian steaming westward. What is your local time?

It is 1000, 5 July.

It is 1000, 6 July.

It is 2200, 7 July.

It is 1000, 7 July.

707

On 6 June 1983, at 1719 EST (ZD +5), what will be the predicted height of tide at Chester, PA?

0.8 feet( 0.2 meters)

1.1 feet (0.3 meters)

3.5 feet (1.1 meters)

4.7 feet (1.4 meters)

708

On a chart, the characteristic of the light on a lighthouse is shown as flashing white with a red sector. The red sector .

indicates the limits of the navigable channel

indicates a danger area

is used to identify the characteristics of the light

serves no significant purpose

709

On a clear, warm day, you notice the approach of a tall cumulus cloud. The cloud top has hard well defined edges and rain is falling from the dark lower edge. Should this cloud pass directly overhead .

it will be preceded by a sudden increase in wind speed

it will be preceded by a sudden decrease in wind speed

the wind speed will not change as it passes

the wind will back rapidly to left in a counterclockwise direction as it passes

710

On a gnomonic chart, a great circle track between Los Angeles and Brisbane will appear as a .

loxodromic curve

curved line concave to the equator

straight line

spiral approaching the poles as a limit

711

On a Mercator chart, 1 nautical mile is equal to .

1 minute of longitude

1 degree of longitude

1 minute of latitude

1 degree of latitude

712

On a nautical chart, the inner ring of a compass rose indicates .

true directions

compass error

deviation

magnetic directions

713

On a voyage along the coast of France, you sight a buoy with the top marks as shown. You are required to steer .

west of the buoy

east of the buoy

south of the buoy

north of the buoy

D026NG

714

On a voyage from Cape Town to London, the favorable ocean current off the coast of Africa is the .

Canary Current

Benguela Current

Agulhas Current

South Atlantic Current

715

On a voyage from Halifax, N.S., to Dakar, West Africa, the Canary Current will .

set the vessel to the left

set the vessel to the right

offer resistance in the form of a head current

furnish additional thrust in the form of a fair or following current

716

On a weather map, a large letter "H" means .

a high pressure area with cool, dry air, and fair weather

a high pressure area with warm, moist air, and inclement weather

horse latitudes, with rough seas and strong winds

a heavy squall line near the "H"

717

On a working copy of a weather map, a cold front is represented by what color line?

Red

Blue

Alternating red and blue

Purple

718

On a working copy of a weather map, a stationary front is represented by which color line?

Red

Blue

Alternating red and blue

Purple

719

On a working copy of a weather map, a warm front is represented by what color line?

Red

Blue

Alternating red and blue

Purple

720

On an Army Corps of Engineers navigation map, each mile A.H.P. on the Lower Mississippi River is marked by a .

dashed red line

number showing mileage

navigation light

black dot

721

On an Atlantic Ocean voyage from New York to Durban, South Africa, you should expect the Agulhas Current to present a strong .

offshore set

onshore set

head current

fair or following current

722

On an isomagnetic chart, the line of zero variation is the .

zero variation line

isogonic line

variation line

agonic line

723

On approaching the English Channel on course 080T, you note the symbol YBY near a charted buoy. You must pass .

northward of the buoy

southward of the buoy

eastward of the buoy

westward of the buoy

724

On charts of U.S. waters, a magenta marking is NOT used for marking a .

radio beacon

lighted buoy

prohibited area

5-fathom curve

725

On entering from seaward, a starboard side daymark will .

show a fixed red light if lighted

show a Morse (A) white light

be square in shape

have an even number if numbered

726

On March 17, at 0500 zone time, you cross the 180th meridian steaming eastward to west longitude. What is your local time?

You are in -12 time zone.

It is 1700, March 18.

It is 0500, March 16.

It is 0500, March 18.

727

On mid-ocean waters, the height of a wind-generated wave is not affected by the .

water depth exceeding 100 feet

fetch

wind's velocity

duration of the wind

728

On navigational aids, what does the light characteristic "Fl(2+1)" mean?

A flashing light combined with a fixed light of greater brightness

Light flashes combined in groups, with a different number of flashes in each group

A light showing groups of two or more flashes at regular intervals

A fixed light varied at regular intervals by groups of two or more flashes of greater brightness

729

On November 1st the zone time is 1700 EST (ZD +5) in LONG 75W. What is the corresponding zone time and date in LONG 135E?

0700, November 2nd

0700, November 1st

2200, November 1st

2200, October 31st

730

On the approach of a warm front, barometric pressure usually .

falls

is steady

is uncertain

rises

731

On the Corps of Engineer's Navigation Maps, the channel is .

midway between the banks

indicated by depths (in feet)

indicated by a broken line

not indicated

732

On the Mississippi and Ohio Rivers, there is a special type of fog known as steam fog. It is caused by .

warm air passing over much colder water

cold air passing over much warmer water

a rapid cooling of the ground on a clear night

rain coming out of a warm air mass aloft

733

On the Mississippi River, gage zero is the gage reading measured from the .

National Geodetic Vertical Datum

low water reference plane

the lowest recorded river depth

the highest recorded river depth

734

On the pole side of the high pressure belt in each hemisphere, the pressure diminishes. The winds along these gradients are diverted by the Earth's rotation toward the east and are known as the .

geostrophic winds

doldrums

horse latitudes

prevailing westerlies

735

On the pole side of the trade wind belt, there is an area of high pressure with weak pressure gradients and light, variable winds. This area is called the .

prevailing westerlies

geostrophic winds

doldrums

horse latitudes

736

On the Western Rivers, a vessel crossing a river must .

only keep out of the way of a power-driven vessel descending the river

keep out of the way of any vessel descending the river

keep out of the way of a power-driven vessel ascending or descending the river

keep out of the way of any vessel ascending or descending the river

737

On U.S. charts, you can tell if a named feature such as a rock (i.e. Great Eastern Rock in Block Island Sound) is submerged by the .

color of ink used to print the name

style of type used to print the name

dashed circle around the feature

magenta circle around the feature

738

On what does the operation of an aneroid barometer depend?

Thin, metal, air tight cell

Curved tube containing alcohol

Column of mercury supported by atmospheric pressure

Expansion of mercury in a closed tube

739

One point of a compass is equal to how many degrees?

7.5

11.25

17.5

22.5

740

Opposition occurs when .

the Sun, Earth, and Moon are at right angles

the Sun's declination is 0 and is moving south

an inferior planet is at the maximum angle to the line of sight to the Sun

the Earth is between a planet and the Sun

741

Other than the Sun and Moon, the brightest object in the sky is .

Sirius

Canopus

Venus

Jupiter

742

Perihelion is the point where the Sun .

is nearest to the Earth

is farthest from the Earth

is on the opposite side of the Earth from the Moon

and Moon and Earth are in line

743

Permanent magnetism is caused by .

operation of electrical equipment and generators on board ship

the earth's magnetic field affecting the ship's hard iron during construction

the horizontal component of the earth's magnetic field acting on the horizontal soft iron

the vertical component of the earth's magnetic field acting on the vertical soft iron

744

Permission to enter the riverward chamber of twin locks is given by the lockmaster and consists of which sound signal?

One short blast

Two short blasts

One long blast

Two long blasts

745

Permission to leave the riverward chamber of twin locks is given by the lockmaster and consists of which sound signal?

One short blast

Two short blasts

One long blast

Two long blasts

746

Plain language is usually used on marine weather .

forecasts

observations

analyses

synoptic chart

747

Planetary aberration is due, in part, to .

refraction of light as it enters the Earth's atmosphere

rotation of the Earth on it's axis

the body's orbital motion during the time required for its light to reach Earth

a false horizon

Port side daymarks may be .

numbered

octagonal

black and white

of any shape

749

Preferred channel buoys indicate the preferred channel to transit by .

odd or even numbers

the color of their top band

the location of the buoy in the channel junction

the buoy's light rhythms

750

Pressure gradient is a measure of .

a high-pressure area

pressure difference over horizontal distance

pressure difference over time

vertical pressure variation

751

Prevailing winds between 30N and 60N latitude are from the .

north

south

east

west

752

Priming of the tides occurs .

at times of new and full Moon

when the Earth, Moon, and Sun are lying approximately on the same line

when the Moon is between first quarter and full and between third quarter and new

when the Moon is between new and first quarter and between full and third quarter

753

Prior to reading an aneroid barometer, you should tap the face lightly with your finger to .

expose any loose connections

demagnetize the metal elements

bring the pointer to its true position

contract and expand the glass face

754

Privately maintained aids to navigation included in the Light List .

are painted white and must use a white light if lighted

must be conspicuously marked by a signboard with the words "PRIVATE AID"

must conform to the standards of the U.S. Aids to Navigation System

are not permitted in or along first-class waterways and may be authorized for second- and third-class waterways

755

Quadrantal error in a gyrocompass has its GREATEST effect .

in high latitudes

near the equator

on north or south headings

on intercardinal headings

756

Radar makes the most accurate determination of the .

direction of a target

distance to a target

size of a target

shape of a target

757

Radiation fog .

always forms over water

is formed by a temperature inversion

is thinnest at the surface

dissipates during the evening

758

Raster-scan chart data is .

the only format recognized by IMO/IHO

organized into many separate files

composed of files that are smaller than vector files

a digitized "picture" of a chart in one format and one layer

759

Recurvature of a hurricane's track usually results in the forward speed .

increasing

decreasing

remaining the same

varying during the day

760

Red lights may appear on .

horizontally banded buoys

vertically striped buoys

yellow buoys

spherical buoys

761

Red sectors of navigation lights warn mariners of .

floating debris

heavily trafficked areas

recently sunken vessels

shoals or nearby land

762

Referring to the illustration, which wind speed is reported in position C?

3 knots

10 knots

20 knots

30 knots

D049NG

763

Relative humidity is defined as .

the maximum vapor content the air is capable of holding

the minimum vapor content the air is capable of holding

the ratio of the actual vapor content at the current temperature to the air's vapor holding capability

the relation of the moisture content of the air to barometric pressure

764

Relative humidity is the percentage of water vapor that is in the air as compared to the maximum amount it can hold at .

a specific barometric pressure

a specific temperature

a specific wind speed

any time

765

Restricted areas at locks and dams are indicated by .

flashing red lights upstream and fixed red lights downstream

yellow unlighted buoys

signs and/or flashing red lights

red daymarks upstream and green daymarks downstream

766

Retrograde motion is the .

movement of the points of intersection of the planes of the ecliptic and the equator

apparent westerly motion of a planet with respect to stars

movement of a superior planet in its orbit about the Sun

movement of the celestial north pole in an elliptical pattern in space

767

Right ascension is primarily used by the navigator for .

calculating amplitudes

calculating great circle sailings by the Ageton method

entering the Air Navigation Tables (Selected Stars) Pub 249

plotting on star finders

Safe water buoys may show ONLY .

flashing red lights

flashing green lights

white lights

yellow lights

769

Scales on aneroid barometers are usually graduated in inches of mercury in the general range of .

26 to 29 inches

28 to 31 inches

30 to 33 inches

32 to 35 inches

770

Set of the current is .

its velocity in knots

direction from which it flows

estimated current

direction towards which it flows

771

Severe tropical cyclones (hurricanes, typhoons) occur in all warm-water oceans except the .

Indian Ocean

North Pacific Ocean

South Pacific Ocean

South Atlantic Ocean

Sextant A reads .

2942.7'

2945.7'

2951.8'

3047.2'

D043NG

773

Sextant B in illustration D043NG reads .

3051.0'

3042.5'

3047.5'

3100.0'

D043NG

774

Sextant C in illustration D043NG reads .

3045.9'

2956.0'

2952.0'

2947.5'

D043NG

Sextant D reads .

3047.5'

2947.5'

2942.5'

2941.6'

D043NG

776

Shown are the symbols used on radio facsimile weather charts. The symbol indicated at letter "I" represents .

rain showers

thunderstorms

snow storms

sand storms

D042NG

777

Sidereal hour angle is always .

measured westward from the hour circle containing the first point of Aries

measured from the point on the celestial sphere occupied by the Sun at the vernal equinox

subtracted from the LHA of the star to obtain the LHA of Aries

All of the above

778

Sidereal time is NOT used .

as the basis for star charts

to enter a star finder

in sight reduction using Pub 249

in sight reductions of planet observations

779

Sidereal time is used by navigators when .

used with the equation of time

used in the form of LHA Aries

calculating the time of moonrise

determining local apparent time

780

Small, visible mound-like protuberances on the bottom of cumulonimbus clouds, that are potential breeding grounds for waterspouts and tornadoes, are called .

thunderheads

mamma

rime

ice prisms

781

Solid green arrows on the main body of a pilot chart indicate .

prevailing wind directions

prevailing ocean current directions

probable surface current flow

shortest great circle routes

782

Some lights used as aids to marine navigation have a red sector to indicate a danger area. How are the limits of a colored sector of light listed in the Light List?

Geographical positions outlining the area of the sector

True bearings as observed from the light toward a vessel

True bearings as observed from a vessel toward the light

Bearings given in the Light List are always magnetic

783

Some lights used as aids to marine navigation have a red sector to indicate a danger area. The limits of a colored sector of a light are listed in the Light List in which of the following manners?

Geographical positions outlining the area of the sector

True bearings as observed from the ship toward the light

An outline of the area of the sector

True bearings as observed from the light toward the ship

784

Some locations maintain a zone time of -13. What are the Greenwich time and date if the zone time and date are 0152, 10 January?

1252, 9 January

1452, 9 January

0052, 11 January

1452, 11 January

785

Some locations maintain a zone time of -13. What are the zone time and date if the Greenwich time and date are 0152, 10 January?

0052, 9 January

0258, 9 January

1452, 10 January

0052, 11 January

786

Some locations maintain a zone time of -13. What are the zone time and date if the Greenwich time and date are 2152, 10 January?

1052, 9 January

0852, 10 January

1052, 10 January

1052, 11 January

787

Some places maintain a zone time of -13. What are the time and date at Greenwich if the zone time and date are 2152, 10 January?

1052, 9 January

0852, 10 January

1052, 10 January

1052, 11 January

788

Sometimes foreign charts are reproduced by NGA (NIMA). On such a chart a wire dragged (swept) area may be shown in purple or .

green

red

magenta

yellow

789

Sometimes foreign charts are reproduced by NGA (NIMA). On such a chart, a wire-dragged, swept area may be shown in green or .

red

black

purple

yellow

790

Spoil grounds, anchorage areas, cable areas, and military exercise areas are all marked by yellow buoys. Which special mark on the buoy will indicate the specific area you are in?

A topmark triangular in shape

A topmark spherical in shape

Lettering on the buoy

A topmark consisting of two cones with the points up

791

Spring tides are tides that .

have lows lower than normal and highs higher than normal

have lows higher than normal and highs lower than normal

are unpredictable

occur in the spring of the year

792

Spring tides occur .

when the moon is new or full

when the moon and sun have declination of the same name

only when the moon and sun are on the same sides of the earth

at the beginning of spring when the sun is over the equator

793

Spring tides occur .

at the start of spring, when the Sun is nearly over the equator

only when the Sun and Moon are on the same side of the Earth and nearly in line

when the Sun and Moon are at approximately 90 to each other as seen from the Earth

when the Sun, Moon, and Earth are nearly in line, in any order

794

Spring tides occur when the .

Moon is in its first quarter or third quarter phase

Sun and Moon are in quadrature

Moon's declination is maximum and opposite to that of the Sun

Moon is new or full

795

Squall lines with an almost unbroken line of threatening dark clouds and sharp changes in wind direction, generally precede a(n) .

slow-moving warm front

fast-moving cold front

stationary front

occluded front

796

Static on your AM radio may be .

an indication of nearby thunderstorm activity

an indication of "clearing" weather

of no meteorological significance

a sign of strong winds

797

Steady precipitation is typical of .

coming cold weather conditions

a warm front weather condition

high pressure conditions

scattered cumulus clouds

798

Steam fog is most likely to occur on the Mississippi and Ohio Rivers in .

spring, around late evening

spring, around early evening

fall, around early morning

fall, around midday

799

Steam smoke will occur when .

extremely cold air from shore passes over warmer water

warm dry air from shore passes over cooler water

cold ocean water evaporates into warm air

cool rain passes through a warm air mass

800

Stormy weather is usually associated with regions of .

high barometric pressure

low barometric pressure

steady barometric pressure

changing barometric pressure

801

Superior conjunction occurs when .

the Sun is at maximum declination north or south

a planet crosses the external plane of the ecliptic

the Sun is between the Earth and a planet

two planets are in line

802

Swell is the rise and fall of the ocean's surface due to .

fetch

distant winds

local storms

the pull of the moon

803

Swells that have outrun the storm are produced in the .

left front quadrant

right front quadrant

rear

directly ahead on the storms projected track

804

Temperature and moisture characteristics are modified in a warm or cold air mass due to .

pressure changes in the air mass

movement of the air mass

the heterogeneous nature of the air mass

upper level atmospheric changes

805

That half of the hurricane to the right hand side of its track (as you face the same direction that the storm is moving) in the Northern Hemisphere is called the .

windward side

leeward side

safe semicircle

dangerous semicircle

806

The "head of the bend" is the .

top or upstream beginning of a bend

bottom or downstream beginning of a bend

midpoint or center radius of a bend

center line or apex of a bend

807

The "horse latitudes" are regions of .

brisk prevailing winds

light airs and calms

abundant blue sea grass vegetation

None of the above

808

The 10-cm radar as compared to a 3-cm radar of similar specifications will .

be more suitable for river and harbor navigation

provide better range performance on low lying targets during good weather and calm seas

have a wider horizontal beam width

have more sea return during rough sea conditions

809

The 3-cm radar as compared to a 10-cm radar with similar specifications will .

give better range performance in rain, hail, etc.

display small targets in a mass of dense sea clutter at a greater range

have less sea return in choppy rough seas

display a more maplike presentation for inshore navigation

810

The abbreviation L.W.R.P. on the navigation maps means .

low water reference plane

low winter runoff point

least water river plane

land wall reference point

811

The accuracy of an azimuth circle can be checked by .

sighting a terrestrial range in line and comparing the observed bearing against the charted bearing

aligning the relative bearing markings so that 000 is on the lubber's line and the line of sight passes over the center of the compass

ensuring that the alignment marks on the inner face of the circle are in line with those on the repeater on relative bearings of 000 and 090

comparing observed azimuths at different altitudes with computed values at the times of observation to see if the difference is constant

812

The agonic line on an isomagnetic chart indicates the .

magnetic equator

magnetic longitude reference line

points where there is no variation

points where there is no annual change in variation

813

The altitude at LAN may be observed by starting several minutes in advance and continuing until a maximum altitude occurs. This procedure should not be used .

when the declination and latitude are of different names

when the declination is greater than and the same name as the latitude

if the vessel is stopped or making bare steerageway

on a fast vessel on northerly or southerly headings

814

The angle at the pole measured through 180From the prime meridian to the meridian of a point is known as .

the departure

the polar arc

longitude

Greenwich hour angle

815

The angle measured eastward from the vernal equinox along the celestial equator often expressed in time units is the .

Greenwich sidereal time

right ascension

local sidereal time

sidereal hour angle

816

The angle measured from the observer's meridian, clockwise or counterclockwise up to 180, to the vertical circle of the body is the .

local hour angle

azimuth angle

meridian angle

observer's longitude

817

The angle that is measured westward from the first point of Aries to the hour circle of the body along the celestial equator is the .

Greenwich sidereal angle

local sidereal time

sidereal hour angle

azimuth angle

818

The annual change in variation for an area can be found in .

the handbook for Magnetic Compass Adjustment, Pub 226

the center of the compass rose on a chart of the area

the compass deviation table

Variation does not change.

819

The apparent wind is zero when the true wind is .

zero

from ahead and equal to the ship's speed

from astern and equal to the ship's speed

from astern and is twice the ship's speed

820

The apparent wind's speed can be zero, but only when two conditions are present. One condition is that the true .

wind must be on the beam

wind's speed must be zero

wind must be from dead ahead

wind's speed equals the ship's speed

821

The appearance of nimbostratus clouds in the immediate vicinity of a ship at sea would be accompanied by which of the following conditions?

Rain and poor visibility

Dropping barometric pressure and backing wind in the Northern Hemisphere

High winds and rising sea

Severe thunderstorms

822

The approximate distance to a storm center can be determined by noting the hourly rate of fall of the barometer. If the rate of fall is 0.08 - 0.12 inches, what is the approximate distance to the storm center?

50 to 80 miles

80 to 100 miles

100 to 150 miles

150 to 250 miles

823

The approximate mean position of the axis of the Gulf Stream east of Palm Beach, FL, is .

35 nautical miles

25 nautical miles

15 nautical miles

5 nautical miles

824

The approximate positions of the stars are based on sidereal time, which is based upon rotation of the Earth relative to .

winter solstice

autumnal equinox

summer solstice

vernal equinox

825

The arc of a great circle which passes through the body and celestial poles is part of the .

hour circle

diurnal circle

observer's meridian

altitude circle

D007NG

826

The arc of an hour circle between the celestial equator and a point on the celestial sphere, measured northward or southward through 90, is the .

altitude

declination

latitude

azimuth angle

827

The area of strong westerly winds occurring between 40S and 60S latitude is called the .

polar easterlies

prevailing westerlies

roaring forties

jet streams

828

The ARPA may swap targets when automatically tracking if two targets .

are tracked on reciprocal bearings

are tracked at the same range

are tracked on the same bearing

pass close together

829

The atmosphere in the vicinity of a high pressure area is called a(n) .

anticyclone

cold front

occluded front

cyclone

830

The autumnal equinox is the point where the Sun is at .

maximum declination north

maximum declination south

0 declination going to northerly declinations

0 declination going to southerly declinations

831

The average height of the surface of the sea for all stages of the tide over a 19 year period is called .

mean high water

mean low water

half-tide level

mean sea level

832

The azimuth angle of a sun sight is always measured from the .

Greenwich meridian

prime vertical circle

principal vertical circle

first point of Aries

833

The barometer is an instrument for measuring the .

temperature

relative humidity

dew point

atmospheric pressure

834

The bases of middle clouds are located at altitudes of between .

3,000 to 6,500 feet (914 to 1981 meters)

6,500 to 20,000 feet (1981 to 6096 meters)

10,000 to 35,000 feet (3048 to 10,668 meters)

20,000 to 60,000 feet (6096 to 18,288 meters)

835

The beam width of your radar is 2. The left tangent bearing of a small island, as observed on the PPI scope, is 056pgc. If the gyro error is 2E, what bearing would you plot on the chart?

052

056

059

060

836

The Beaufort scale is used to estimate the .

wind direction

percentage of cloud cover

wind speed

barometric pressure

837

The belt of light and variable winds between the westerly wind belt and the northeast trade winds is called the .

subtropical high pressure belt

intertropical convergence zone

doldrum belt

polar frontal zone

838

The Benguela Current flows in a .

SW'ly direction along the NW coast of Africa

S'ly direction off the East Coast of Australia

NW'ly direction along the SW coast of Africa

SW'ly direction along the SE coast of Greenland

839

The best estimate of the wind direction at sea level can be obtained from observing the direction of the .

cloud movement

vessel heading

waves

swells

840

The Brazil Current flows in which general direction?

Northwesterly

Southwesterly

Southeasterly

Northerly

841

The buoy indicated by the letter A is a .

nun

can

spar

pillar

D044NG

842

The buoy indicated by the letter D as shown is a .

nun

can

spar

pillar

D044NG

843

The buoy symbol printed on your chart is leaning to the northeast. This indicates .

you should stay to the north or east of the buoy

you should stay to the west or south of the buoy

the buoy is a major lighted buoy

nothing special for navigational purposes

844

The cardinal mark topmark shown in illustration D024NG represents which quadrant?

Northern

Eastern

Southern

Western

D024NG

845

The celestial coordinate of a star that is relatively constant in value is the .

Greenwich hour angle

local hour angle

sidereal hour angle

meridian angle

846

The center of a circle of equal altitude, plotted on the surface of the Earth, is the .

dead reckoning position of the observer

assumed position of the observer

geographical position of the body

assumed position of the body

847

The change in the length of day becomes greater