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You are on course 355T and take a relative bearing of a lighthouse of 275. What is the true bearing of the lighthouse? 085 270 280 080
You are on course 222T and take a relative bearing of a lighthouse of 025. What is the true bearing to the lighthouse? 247 315 197 335
You are on course 357T and take a relative bearing of a lighthouse of 180. What is the true bearing to the lighthouse? 227 177 363 003
You are on course 344T and take a relative bearing of a lighthouse of 270. What is the true bearing to the lighthouse?
074
090
254
016
You are on course 180T and take a relative bearing of a lighthouse of 225. What is the true bearing of the lighthouse? 270 045 180 135
You take a bearing of 264 of a lighthouse. What bearing of another object would give the best fix?
081
350
120
289
You take a bearing of 086 of a lighthouse. What bearing of another object would give the best fix? 000 066 112 271
You take a bearing of 176 of a lighthouse. Which bearing of another object would give the best fix? 079 151 176 292
You take a bearing of 176 of a lighthouse. What bearing of another object would give the best fix? 000 021 189 272
You take a bearing of 356 of a lighthouse. What bearing of another object would give the best fix? 201 013 082 176
You take a bearing of 356 of a lighthouse. Which bearing of another object would give the best fix? 178 256
342 013
You take a bearing of 313 and 076 of two objects. Which bearing of a third object will give the best fix? 014 133 339 255
You take a bearing of 191 and 313 to two objects. Which bearing of a third object will give the best fix? 022 131 211 249
You take a bearing of 086 of a lighthouse. Which bearing of another object would give the best fix? 261 291 242 196
You take a bearing of 264 of a lighthouse. Which bearing of another object would give the best fix?
239
059
291
182
You take a bearing of 191 and 313 to two objects. Which bearing of a third object will give the best fix? 001 069 209 356
You take a bearing of 142 and 259 of two objects. Which bearing of a third object will give the best fix? 234 201 081 238
You take a bearing of 142 and 259 of two objects. What bearing of a third object will give the best fix? 084 281 019 166
You take a bearing of 043 and 169 of two objects. What bearing of a third object will give the best fix? 201
 
356 144 102
You take a bearing of 043 and 169 of two objects. What bearing of a third object will give the best fix? 309 073 356 192
You take bearings of 313T and 076T on two objects. Which bearing of a third object will give the best fix? 048T 101T 142T 187T
A position on the Earth has a longitude of 7410'E. Its celestial counterpart would have a __________.

GHA of 28550'

SHA of 28550'

LHA of 7410'E

SHA of 7410'
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 192T, Sp 23 knots C 278T, Sp 6 knots C 099T, Sp 17 knots
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 101T, Sp 7 knots C 349T, Sp 25 knots C 018T, Sp 6 knots C 079T, Sp 24 knots
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 095T, Sp 30 knots C 268T, Sp 22 knots C 162T, Sp 27 knots C 356T, Sp 5.5 knots
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 112T, Sp 4 knots

C 291T, Sp 25 knots

C 166T, Sp 24 knots

C 013T, Sp 7 knots
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 __________. on a fast vessel on northerly or southerly headings if the vessel is stopped or making bare steerageway when the declination and latitude are of different names when the declination is greater than and the same name as the latitude
In order for a star to be used for a sight at lower transit, the star must __________. have a declination equal to or greater than your latitude have the SHA equal to or less than the LHA have a GHA of 180 be circumpolar
A body can only be observed at lower transit when __________. the body is circumpolar the algebraic sum of the colatitude and declination exceeds 90 the declination is the opposite name to the latitude the observer is in high latitudes above either polar circle
When taking stars, those bodies to the east and west will __________. change altitude rapidly remain in an almost fixed position change altitude slowly appear to be moving in the plane of the horizon
When taking an amplitude, the Sun's center should be observed on the visible horizon when __________. the declination is of a different name from the latitude the Sun is near or at a solstice in high latitudes the Sun's declination is at or near 0
An amplitude of the Sun in high latitudes __________. should only be observed when the Sun's lower limb is above the horizon is most accurate before sunrise is most accurate after sunset is most accurate when the Sun's center is observed on the visible horizon
What is the longitude of the geographical position of a body whose Greenwich hour angle is 21030'? 3030'E 12030'W 14930'E 5930'W
What is the geographic longitude of a body whose GHA is 23227'? 6152'E 6152'W 5227'E 12733'E
What is the geographic longitude of a body whose GHA is 21515'? 3515'E 3515'W 14445'E 14445'W
The line of position determined from a sight with an observed altitude (Ho) of 8845.0' should be __________. plotted by using an intercept from an assumed position plotted as an arc around the GP of the body calculated as a longitude line reduced to the meridian and plotted as a latitude line
When plotting a circle of equal altitude for a high altitude sight, the radius of the circle is determined by the formula __________. 180 - GHA z - d 90 - Ho GHA - LHA
The line of position should be plotted as a circle around the GP of the body when the Ho exceeds what minimum value? 80 83 85 87
The GP of a body for a high altitude sight is determined from the declination and the __________. Greenwich hour angle zenith distance azimuth right ascension
The center of a circle of equal altitude, plotted on the surface of the Earth, is the __________. geographical position of the body assumed position of the body assumed position of the observer dead reckoning position of the observer
The GP of a body for a high altitude sight is determined from the declination and the __________. sidereal hour angle observed altitude Greenwich hour angle right ascension
The GP of a body for a high altitude sight is determined from the Greenwich hour angle and the __________. zenith distance declination azimuth angle circle of equal altitude
What is the major problem with taking high altitude sun observations? The tables are not as accurate due to inherent errors in the spherical triangle at high altitudes. Rapidly changing altitudes make it difficult to get an accurate altitude. Possible errors due to unusual refraction may exist. It is difficult to establish the point where the sextant is vertical to the horizon.
What is the major advantage of high altitude observations? The semidiameter correction of the sextant altitude is eliminated. Errors due to unusual parallax are eliminated. The same body can be used for a fix from observations separated by several minutes. The declination is the only information needed from the almanac.
Why are low altitude sun sights not generally used? Modern sight reduction tables are not complete for low altitudes below 5. The glare on the horizon causes irradiation errors. Errors due to unusual refraction may exist. Sextants may have large errors at small angles of elevation.
In high latitudes, celestial observations can be made over a horizon covered with pack ice by bringing the sun tangent to the ice and __________. 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 adding 30 of arc to the sight
At morning stars, the first stars that should be observed are those with an azimuth in which quadrant? Western Eastern Northern Southern
At morning stars, the last stars that should be observed are those with an azimuth in which quadrant? Western Eastern Northern Southern
At evening stars, the first stars that should be observed are those with an azimuth in what quadrant? Western
Northern Eastern
Southern
At evening stars, the last stars that should be observed are those with an azimuth in what quadrant? Northern Eastern Western Southern
In general, the most effective period for observing stars and planets occurs during the darker limit of __________. astronomical twilight nautical twilight civil twilight sunset
A dead reckoning (DR) plot __________.
must be plotted using magnetic courses ignores the effect of surface currents is most useful when in sight of land may be started at an assumed position
A dead reckoning (DR) plot __________.
should be replotted hourly
should be started each time the vessel's position is fixed
must utilize magnetic courses
must take set and drift into account
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 with you at 2 knots against you at 10 knots slack
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 deep water in shallow water
The type of current which will have the greatest effect on the course made good for your vessel is __________. one that flows at nearly right angles to your course steered a rotary current in which the direction of current flow constantly changes one flowing in the same direction as your course steered one flowing in the opposite direction as your course steered
You are heading in a northerly direction when you come across an easterly current. Your vessel will __________. be pushed to port decrease in engine speed remain on course be pushed to starboard
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? You must increase speed to compensate for the current. The current cannot be determined. The current is westerly at 0.5 knot. The drift is 0.25 knot.
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 1.0 knot. The set is 270, drift 0.5 knot. The set is 270, drift 0.25 knot.
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. You should alter course to the right to regain the track line. The current is perpendicular to your track line. The drift is 0.5 knot.
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 270, drift 1.0 knot. The set is 090, drift 0.5 knot. The set is 270, drift 0.5 knot. The set is 090, drift 1.0 knot.
Which statement concerning current is TRUE? Current can be determined by measuring the direction and distance between simultaneous EP and DR positions. The distance between a simultaneous DR position and fix is equal to the drift of the current. The drift of the current should be averaged out on a one hour basis. After the current is determined, it should not be used for further plotting because it is an unknown variable.
Which error is NOT included in the term "current" when used in relation to a fix? Poor steering Leeway Ocean currents Known compass error
You are proceeding up a channel at night. It is marked by a range which bears 185T. You steady up on a compass course of 180 with the range in line dead ahead. This indicates that you(r) __________. are being affected by a southerly current must come right to get on the range course is in error compass has some easterly error
You are steering a southerly course, and you note that the chart predicts an easterly current. Without considering wind, how may you allow for the set? Decrease your speed Increase your speed Head your vessel slightly to the right Head your vessel slightly to the left
Your vessel is making way through the water at a speed of 12 knots. Your vessel traveled 30 nautical miles in 2 hours 20 minutes. What current are you experiencing? A following current of 0.9 knot A following current at 2.0 knots A head current of 2.0 knots A head current of 0.9 knot
When possible, a DR plot should always be started from where? A known position An assumed position Any position None of the above
The direction in which a vessel is steered is the course. The path actually followed is the __________. route course over the ground heading track
The paths of intended travel between three or more points is the __________. bearing track course course over the ground
The direction in which a vessel should be steered between two points is the __________. course bearing course over the ground heading
The direction a vessel is pointed at any given time is the __________. heading course track course over the ground
The path that a vessel is expected to follow, represented on a chart by a line drawn from the point of departure to the point of arrival, is the __________.
estimated course
DR plot
heading
track line
The difference between the DR position and a fix, both of which have the same time, is caused by __________. deviation current leeway variation
You plot a fix using three lines of position and find they intersect in a triangle. You should plot the position of the vessel __________. in the geometric center of the triangle outside of the triangle on the line of position from the nearest object, between the other two lines of position anywhere in the triangle
In illustration D051NG below, why was the position labeled "E" plotted? the vessel's position was fixed at 1145 the position is a running fix a dead reckoning position is plotted for each speed change a dead reckoning position is plotted within a half-hour of each course change
In illustration D051NG below what is indicated by the position labeled "C"? estimated position fix running fix dead reckoning position
You are navigating in pilotage waters using running fixes. The maximum time between fixes should be about __________. 5 minutes 1 hour 30 minutes 4 hours
How many fixed objects are needed to plot a running fix? None One Two Three
In illustration D051NG below, why was the position labeled "C" plotted? running fixes are better estimates of true position than dead-reckoning positions the vessel's speed changed the vessel's course changed form due North to due East All of the above.
You should plot your dead reckoning position __________.
only in pilotage waters
from every fix or running fix
every three minutes in pilotage waters
from every estimated position
You should plot a dead reckoning position after every __________. fix or running fix course change speed change All of the above.
In illustration D051NG below, why was the position labeled "D" plotted? the vessel's speed changed at 1125 a dead reckoning position is plotted within 30 minutes of a running fix a dead reckoning position is plotted for each course change All of the above.
A position obtained by applying ONLY your vessel's course and speed to a known position is a __________. dead-reckoning position running fix fix probable position
Your dead reckoning position should be plotted __________. when coming on or going off soundings at least every hour on the hour in the open waters of the sea whenever an estimated position is plotted when it agrees with your GPS position
You plot a fix using three lines of position and find they intersect in a triangle. The actual position of the vessel __________. may be inside or outside of the triangle is outside of the triangle is the geometric center of the triangle may be anywhere in the triangle
You are plotting a running fix in an area where there is a determinable current. How should this current be treated in determining the position? The set should be applied to the second bearing. The current should be ignored. The course and speed made good should be determined and used to advance the LOP. The drift should be added to the ship's speed.
Which statement about an estimated position is TRUE? It is more reliable than a fix based on radar bearings. When a 3-LOP fix plots in a triangle, the center of the triangle is the estimated position. It may be based on a single LOP or questionable data. It is usually based on soundings.
A position that is obtained by using two or more intersecting lines of position taken at nearly the same time, is a(n) __________. running fix dead-reckoning position fix estimated position
You are taking bearings on two known objects ashore. The BEST fix is obtained when the angle between the lines of position is __________. 45 30 60 90
Which position includes the effects of wind and current? Leeway position Set position Dead reckoning position Estimated position
A position that is obtained by applying estimated current and wind to your vessel's course and speed is a(n) __________. fix dead reckoning position estimated position None of the above
Which position includes the effects of wind and current?
Set position
Estimated position
Leeway position
Dead reckoning position
You are running parallel to the coast and estimate that the current is against you. In plotting a running fix using bearings from the same object on the coast, the greatest safety margin from inshore dangers will result if what speed is used to determine the fix? Maximum speed estimate Average speed estimate Minimum speed estimate A running fix should not be used under these conditions.
You are running parallel to the coast and take a running fix using bearings of the same object. If you are making less speed than used for the running fix, in relation to the position indicated by the fix, you will be __________. closer to the coast farther from the coast on the track line behind the fix on the track line ahead of the fix
You are running parallel to the coast and plotting running fixes using bearings of the same object. You are making more speed than assumed for the running fix. In relation to the position indicated by the fix you will be __________. on the track line behind the fix on the track line ahead of the fix farther from the coast closer to the coast
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
When using a radar in an unstabilized mode, fixes are determined most easily from __________. center bearings tangent bearings ranges objects that are close aboard
You are plotting a running fix. The LOP to be run forward is an arc from a radar range, what technique should be used? The distance between LOP's should be added to the radar range and a new arc swung. The position of the object observed should be advanced to the new time and a new arc swung using the radius of the old arc. The arc should be converted into a straight line using offsets and then run forward. An arc should never be run forward.
A chart position enclosed by a square is a(n) __________. dead reckoning position running fix estimated position fix
A chart position enclosed by a semi-circle is a(n) __________. fix running fix estimated position dead reckoning position
What describes an accurate position that is NOT based on any prior position? Dead-reckoning position Fix Estimated position Running fix
You determine your vessel's position by taking a range and bearing to a buoy. Your position will be plotted as a(n) __________. dead-reckoning position running fix estimated position fix
A single line of position combined with a dead-reckoning position results in a(n) __________.
fix assumed position running fix estimated position
A position obtained by taking lines of position from one object at different times and advancing them to a common time is a(n) __________. estimated position running fix fix dead-reckoning position
A vessel's position should be plotted using bearings of __________. fixed objects fixed known objects on shore buoys close at hand All of the above.
Lines of position may be __________. hyperbolas arcs straight lines All of the above.
A line connecting all possible positions of your vessel at any given time is a __________. fix longitude line line of position latitude line
A line of position is __________. not used in a running fix a line connecting two charted objects the position of your vessel a line on some point of which the vessel may be presumed to be located
A line of position formed by sighting two charted objects in line is called a(n) __________. estimated position relative bearing track line range line
A line of position derived by radar range from an identified point on a coast will be a(n) __________. parabola arc line parallel to the coast straight line
A radar range to a small, charted object such as a light will provide a line of position in which form? Arc Hyperbola Parabola Straight line
A true bearing of a charted object, when plotted on a chart, will establish a __________. line of position range relative bearing fix
What is NOT an advantage of the rhumb line track over a great circle track? Easily plotted on a Mercator chart Plots as a straight line on Lambert conformal charts Negligible increase in distance on east-west courses near the equator Does not require constant course changes
What is the major advantage of a rhumb line track? The rhumb line is the shortest distance between the arrival and departure points. The vessel can steam on a constant heading (disregarding wind, current, etc.). It is easily plotted on a gnomonic chart for comparison with a great circle course. It approximates a great circle on east-west courses in high latitudes.
When is the rhumb line distance the same as the great circle distance? The rhumb line distance is always longer than the great circle distance. Course 090T in high latitudes Course 045T in low latitudes Course 180T when you cross the equator
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 high latitudes in the same hemisphere. The two points are in low latitudes in the same hemisphere. One point is near the equator, one point is in a high latitude, and both are near the 180th meridian. The two points are near the equator, but in different hemispheres.
What is a characteristic of a rhumb line? The course angle constantly changes to form the loxodromic curve. It plots as a straight line on a Lambert conformal chart. It cuts each meridian at the same angle. It is the shortest distance between two points on the Earth.
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
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 __________. be nearer to the pole in the Northern Hemisphere and nearer to the equator in the Southern Hemisphere always be nearer to the equator always be nearer to the elevated pole be nearer to the pole or the equator depending on the latitudes of the arrival and departure positions
The shortest distance between any two points on earth defines a __________. rhumb line small circle great circle hyperbola
What defines a great circle? The smallest circle that can be drawn on the face of a sphere A curved line drawn on a Mercator Chart A course line that inscribes a loxodromic curve The intersection of a plane passing through the center of a sphere.
The latitude of the upper vertex of a great circle is 36N. What is the latitude of the lower vertex? 36S Cannot be determined from the information given 0 36N
A great circle crosses the equator at 141E. It will also cross the equator at what other longitude? 141W 41E 39W 180E
A great circle crosses the equator at 162E. It will also cross the equator at what other longitude? 62E 18W 126W 162W
A great circle crosses the equator at 134E. It will also cross the equator at what other longitude? 46W 34E 134W 124W
A great circle crosses the equator at 173E. It will also cross the equator at what other longitude? 173W 73E 73W 7W
A great circle crosses the equator at 127W. It will also cross the equator at what other longitude? 127E 27W 53E 27E
A great circle crosses the equator at 93W. It will also cross the equator at what other longitude? 177W 87E 13E 177E
A great circle crosses the equator at 17W. It will also cross the equator at what other longitude? 17E 173W 163E 117W
A great circle crosses the equator at 157W. It will also cross the equator at what other longitude? 57E 23E
57W 157E
A great circle will intersect the equator at how many degrees of longitude apart? 0 90 45 180
The distance that a vessel travels from the time that the order to put engines full astern until the vessel is dead in the water is known as __________. head reach advance surge transfer
The vertex of a great circle track is in LONG 109E. An eastbound vessel would cross the equator in LONG __________. 19E 161W 161E 19W
The upper vertex of a great circle track is in LONG 15600'E. Sailing eastward, the great circle track will cross the equator in LONG __________. 6600'E 11400'W 6600'W 11000'W
The distance in longitude from the intersection of a great circle and the equator to the lower vertex is how many degrees of longitude? 135 180 90 45
The longitude of the upper vertex of a great circle track is 169E. What is the longitude of the lower vertex? 169W 076E 011W 101W
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? S 137.25E N 137.25W S 137.25W N 137.25E
The initial great circle course angle between LAT 23003400'S, LONG 1800'E is 063.8. What is the true course? 063.8T 243.8T 116.2T 296.2T
For navigational purposes, each great circle on the Earth has a length of __________. 3,600 miles 21,600 miles 12,500 miles 5,400 miles
Your vessel has changed course and is heading 285T, you are on the charted range and it appears as in illustration D048NG below. After several minutes the range appears as in illustration D047NG below and your heading is still
285T. What does this indicate?
course made good to the left of the DR track leeway caused by a NE'ly wind south-setting current north-setting current
You are on course 355T and take a relative bearing of a lighthouse of 275. What is the true bearing of the lighthouse? 085 280 270 080
You are on course 222T and take a relative bearing of a lighthouse of 025. What is the true bearing to the lighthouse? 247 315 197 335
You are on course 357T and take a relative bearing of a lighthouse of 180. What is the true bearing to the lighthouse? 227 363 003 177
You are on course 344T and take a relative bearing of a lighthouse of 270. What is the true bearing to the lighthouse? 090 074 254 016
You are on course 344T and take a relative bearing of a lighthouse of 090. What is the true bearing to the lighthouse? 016 074 254 270
You are on course 277T and take a relative bearing of a lighthouse of 045. What is the true bearing to the lighthouse? 038 232 315 322
A nautical mile is a distance of approximately how much greater than or less than a statute mile? 1/4 greater 1/4 less 1/7 less 1/7 greater
A nautical mile is a distance of approximately how much greater than or less than a statute mile? 1/7 greater 1/7 less 1/4 less 1/4 greater
You are outbound in a channel marked by a range astern. The range line is 309T. You are steering 127T and have the range in sight as shown in illustration D047NG below. What action should you take? Come left until the range comes in line then alter course to 125T. Come right to 129T. Come right to close the range then when on the range steer 129T. Come left until the range comes in line then alter course to 129T.
You are inbound in a channel marked by a range. The range line is 309T. You are steering 306T and have the range in sight as shown in illustration D048NG below. Which action should you take? Immediately alter course to 309T if the range is closing. Continue on the present heading until the range is in line then alter course to the right. Immediately alter course to the left to bring the range in line. Immediately alter course to the right to bring the range in line.
You are inbound in a channel marked by a range. The range line is 040T. You are steering 036T. The range is in sight as shown in illustration D047NG below, and is closing. Which action should you take? Immediately alter course to 040T. Continue on the present heading until the range is in line then alter course to the left. Immediately alter course to the right to bring the range in line. Continue on course until the range is closed, then alter course to the right.
You are inbound in a channel marked by a range. The range line is 216T. You are steering 213T and have the range in sight as shown in illustration D048NG below. Which action should you take? Immediately alter course to the right to bring the range in line. Immediately alter course to the left to bring the range in line. Continue on the present heading until the range is in line then alter course to the right. Immediately alter course to 216T if the range is closing.
You are outbound in a channel marked by a range astern. The range line is 273T. You are steering 090T and have the range in sight as shown in illustration D047NG below. What action should you take? Come right to 093 T. Come right to close the range then when on the range steer 093 T. Come left until the range comes in line then alter course to 087 T. Come left until the range comes in line than alter course to 093 T.
You are inbound in a channel marked by a range. The range line is 133T. You are steering 129T and have the range in sight as shown in illustration D048NG below. Which action should you take? Immediately alter course to the left to bring the range in line. Immediately alter course to 133T if the range is closing. Continue on the present heading until the range is in line then alter course to the right. Immediately alter course to the right to bring the range in line.
You are outbound in a channel marked by a range astern. The range line is 133T. You are steering 315T and have the range in sight as shown in illustration D048NG below. What action should you take? Come right until the range comes in line then alter course to 317T. Come left to 313T. Come right until the range comes in line then alter course to 313T. Come left to close the range then when on the range steer 313T.
You are entering port and have been instructed to anchor, as your berth is not yet available. You are on a SW'ly heading, preparing to drop anchor, when you observe the range lights as shown in illustration D047NG below, on your starboard beam. What action should you take? ensure your ship will NOT block the channel or obstruct the range while at anchor drop the anchor immediately as a change in the position of the range lights will be an indication of dragging anchor drop the anchor immediately as the range lights mark an area free of obstructions NOT drop the anchor until the lights are in line
What is the relative bearing of an object broad on the port beam? 235 315 270 300
Your vessel is entering port when you change course and steady up on a range with the lights in line. After a few minutes you observe the range lights as shown in illustration D047NG below. How should your heading be altered? right, and when the range lights are in line again, steer to keep them dead ahead right, and when the range lights are in line again, steer to keep them in line fine on the port bow left, and when the range lights are in line again, resume your original heading left, and when the range lights are in line again, steer to keep them in line fine on the starboard bow
Your vessel is entering port and you have steadied up on a range, dead ahead, in line with your keel. After a few minutes the range, still dead ahead, appears as shown in illustration D047NG below. Which action should you take? Alter heading to the left Alter heading to the right Maintain heading, keeping the range dead ahead Increase speed
You are inbound in a channel marked by a range. The range line is 309T. You are steering 306T and have the range in sight as shown in illustration D047NG below. The range continues to open. What action should you take? Alter course to the left to close the range, then alter course to 309T. Alter course to the left until the range closes, then steer to the left of 306T. Alter course to the right to 309T or more to bring the range in line. Maintain course as it is normal for the range to open as you get close.
What is the relative bearing of an object broad on the port bow? 315 330 345 360
You are on course 180T and take a relative bearing of a lighthouse of 225. What is the true bearing of the lighthouse?
270
180
045
135
What is the relative bearing of an object broad on the starboard quarter? 045 090 135 225
You are on course 027T and take a relative bearing to a lighthouse of 220. What is the true bearing to the lighthouse? 113 193 247 279
A relative bearing is always measured from __________. the vessel's beam true north the vessel's head magnetic north
What is the relative bearing of an object dead astern? 270 000 090 180
What is the relative bearing of an object sighted dead ahead?
180 090 015 000
What is the relative bearing of an object broad on the starboard bow? 030 045 060 075
What is the relative bearing of an object broad on the starboard beam? 090 045 060 075
What is the relative bearing of an object broad on the starboard quarter? 090 105 135 150
What is the relative bearing of an object broad on the port quarter? 195 225 240 265
What is the relative bearing of an object on the port beam? 045 090 180 270
You are on course 030T. The relative bearing of a lighthouse is 45. What is the true bearing? 015 075
345 255
You are underway in an area where the charted depth is 8 fathoms. You compute the height of tide to be -4.0 feet. The draft of your vessel is 5.0 feet (1.52 meters). You determine the depth of the water beneath your keel to be __________. 39 feet (11.9 meters) 57 feet (17.4 meters) 43 feet (13.1 meters) 47 feet (14.3 meters)
You are underway in a vessel with a draft of 7.0 feet (2.1 meters). The charted depth for your position is 9 fathoms. You compute the height of tide to be +3.0 feet (0.9 meters). You determine the depth of the water beneath your keel to be __________. 50 feet (15.3 meters) 41 feet (12.6 meters) 32 feet (9.8 meters) 64 feet (19.6 meters)
You are underway in a vessel with a draft of 6.0 feet. You are in an area where the charted depth of the water is 4 fathoms. You would expect the depth of water beneath your keel to be approximately __________. 24 feet 30 feet 12 feet 18 feet
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
When using horizontal sextant angles of three objects to fix your position, an indeterminate position will result in which situation? The vessel is outside of a triangle formed by the objects. The objects lie in a straight line. The vessel is inside of a triangle formed by the objects. A circle will pass through your position and the three objects.
When making landfall at night, the light from a powerful lighthouse may sometimes be seen before the lantern breaks the horizon. This light is called the __________. diffusion elevation loom backscatter
When making landfall at night, you can determine if a light is a major light or an offshore buoy by __________. the intensity of the light the color, because the buoy will have only a red or a green light checking the period and characteristics against the Light List All of the above.
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 Color Period Intensity
When using a buoy as an aid to navigation which of the following should be considered?
The buoy should be considered to be in the charted position if it has been freshly painted.
The buoy should be considered to always be in the charted position.
If the light is flashing the buoy should be considered to be in the charted location.
The buoy may not be in the charted position.
When using a buoy as an aid to navigation which of the following should be considered?

The buoy may not be in the charted position.

If the light is flashing, the buoy should be considered to be in the charted location.

The buoy should be considered to be in the charted position if it has been freshly painted.

The buoy should be considered to always be in the charted location.
When should a navigator rely on the position of floating aids to navigation? During daylight only Only when inside a harbor During calm weather only Only when fixed aids are not available
When navigating a vessel, you __________. can always rely on a buoy to show proper light characteristics should assume a wreck buoy is directly over the wreck should never rely on a floating aid to maintain its exact position can always rely on a buoy to be on station
When you are steering on a pair of range lights and find the upper light is in line above the lower light, you should __________. wait until the lights are no longer in a vertical line continue on the present course come right come left
When you are steering on a pair of range lights and find the upper light is in line above the lower light, you should __________. come left come right wait until the lights are no longer in a vertical line continue on the present course
When you are steering on a pair of range lights and find the upper light is above the lower light you should __________. come left wait until the lights are no longer in a vertical line continue on the present course come right
When you are steering on a pair of range lights and find the upper light is above the lower light you should __________. come left wait until the lights are no longer in a vertical line come right continue on the present course
You are on course 226T. In order to check the latitude of your vessel, you should observe a celestial body on which bearing? 270 026 000 226
You are on course 312T. To check the speed of your vessel you should observe a celestial body on which bearing? 090 222 312 000
You are on course 238T. To check the course of your vessel you should observe a celestial body on which bearing? 328 090 180 238
You are on course 303T. To check the speed of your vessel you should observe a celestial body on which bearing? 090 000 213 123
You are on course 209T. In order to check the longitude of your vessel, you should observe a celestial body on which bearing? 299 209 000 270
A line of position from a celestial observation is a segment of a __________. parallel of declination parallel of altitude circle of equal altitude vertical circle
You are on course 042T. To check the course of your vessel you should observe a celestial body on which bearing? 090 132 180 222
You are on course 146T. To check the speed of your vessel you should observe a celestial body on which bearing? 000 056 090 146
You are on course 201T. To check the speed of your vessel you should observe a celestial body on which bearing? 180 111 201 090
You are on course 061T. To check the longitude of your vessel you should observe a celestial body on which bearing? 061 180 241 090
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
While steering a course of 150T, you wish to observe a body for a latitude check. What would the azimuth have to be? 090T 150T 000T 240T
While steering a course of 150T, you wish to observe the Sun for a speed check. What would the azimuth have to be? 090T 150T 060T 240T
A star is observed at lower transit. The line of position derived from this sight is __________. of no special significance on the prime vertical a longitude line a latitude line
You are on course 138T. To check the latitude of your vessel you should observe a celestial body on which bearing? 138 270 000 318