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Aids to Navigation

What is the function of a red triangular daymark? To mark the centerline of a navigable channel To mark a prominent object of navigational interest To mark an area of a channel where passing is permitted To indicate the starboard side of a channel
Which is a feature of a special daymark? A red-and-white octagon A yellow diamond A green square A daymark with a yellow stripe on it
How do preferred channel buoys indicate the preferred channel to transit? The buoy's light rhythms Odd or even numbers The color of their top band The location of the buoy in the channel junction
What does a white buoy with an open-faced orange diamond on it indicate? The buoy is a mooring buoy Vessels are excluded from the area Operating restrictions are in effect Danger
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.
Yellow lights may appear on which buoys? Horizontally-banded buoys Special purpose buoys Spherical buoys Vertically-striped buoys
As you enter a U.S. channel from seaward, which is TRUE concerning the numbers on the buoys? increase in channels going to the north or west, and decrease in channels going to the south or east increase with the can buoys being odd numbered increase with the can buoys being even numbered decrease with the can buoys being even numbered
Which term is given to a light that has a light period shorter than its dark period? Pulsating Flashing Occulting Alternating
How are buoys which mark isolated dangers are painted? Alternating red and white stripes Alternating green and white bands Alternating red and black bands Alternating green and black bands
How are aids to navigation marking the intracoastal waterway identified? The light characteristic and color for lighted aids Yellow stripes, squares, or triangles marked on them The letters ICW after the aid's number or letter White retro-reflective material
Under the U.S. Aids to Navigation System on the Western Rivers, which describes the daymarks on the right descending bank? Red diamond-shaped panels with red reflector borders Green square-shaped panels with green reflector borders Red triangular-shaped panels with red reflector borders Green triangular-shaped panels with green reflector borders
Under the U.S. Aids to Navigation System on the Western Rivers, which is TRUE of a daymark on the right descending bank? It will have an odd number It will indicate the gage reading Must contain yellow retro-reflective markings It shall be green in color
What do red sectors of navigation lights warn mariners of? Floating debris Heavily trafficked areas Recently sunken vessels Shoals or nearby land
What does a white buoy with an orange cross within a diamond marked on it indicate? An anchorage area Operating restrictions are in effect Vessels are excluded from the area Danger
Which item in illustration D034NG below shows a fixed and flashing light? A B C D
Which would you expect to see on a lighted preferred-channel buoy? A Morse (A) white light A composite group-flashing light A fixed red light A yellow light
You are outbound in a buoyed channel on course 015°T. You sight a white light showing a Morse (A) characteristic bearing 359° relative. For safety, which action should you take? Change course to 359°T to pass near to the buoy Check the chart to see where the marked danger lies in relation to the buoy Stay in the channel and leave the buoy to port Alter course to 000°T and leave the buoy close on the starboard side
A mid-channel buoy, may show which light? An occulting green light A flashing red light A fixed red light A Morse (A) white light
How is the draw span of a floating drawbridge marked? With three red lights on each side of the draw With a flashing blue lights With a yellow and white diamond With a yellow light showing Morse Code (B)
In the U.S. Aids to Navigation System on the Western Rivers, the light characteristic of group flashing (2) is used for which purpose? To indicate daymarks with no lateral significant To indicate the preferred channel To mark the right descending bank To mark the left descending bank
The Light List indicates that a dayboard is a type KGW. You should take which action? Pass it close aboard on either side Look for another daymark to form the range Leave it to port when southbound on the Atlantic Coast ICW Look for a green and white diamond
What color lights do lighted information markers display? White lights Green lights Yellow lights Red lights
When approaching a lock entrance, which flashing light is the visual signal displayed when a single lock is ready for entrance? An amber light A green light A red light A white light
Where are buoys and day beacons exhibiting a yellow triangle or square painted on them used? On isolated stretches of the ICW to mark undredged areas Locations where the ICW and other waterways coincide In minor harbors where the controlling depth is 10 feet (3 meters) or less Only at particularly hazardous turns of the channel
Which is TRUE concerning daymarks marking the starboard side of the channel when going towards the sea? They will be red squares The will be green squares The will be green triangles They will be red triangles
Which is TRUE concerning privately maintained aids to navigation included in the Light List? They must be conspicuously marked by a signboard with the words "PRIVATE AID" They must conform to the standards of the U.S. Aids to Navigation System Not permitted in or along first-class waterways and may be authorized for second- and third- class waterways They are painted white and must use a white light if lighted
Which is TRUE of a preferred-channel buoy? They may be lettered They are spherical They show a white light All of the above.
Which is the term given to the time required for a lighted aid to complete a full cycle of light changes? Set Frequency Function Period
Entering from sea, how would a daymark on the port side of the channel be indicated on a chart? A red triangle with the letter R A white triangle with the letters RG A green square with the letter G A white square with the letters GR
In which situation is the light characteristic of composite group flashing (2 + 1) used in the Aids to Navigation System on the Western Rivers? Only to identify the right descending bank On daymarks with no lateral significance On preferred-channel buoys Only to identify the left descending bank
Under the IALA Buoyage Systems, which is TRUE of the topmark of a red and white vertically- striped buoy? It shall be X-shaped It shall be a single red cone It shall be a single red sphere It shall be two black spheres
Under the IALA-B Buoyage System, which is TRUE of a conical buoy? The buoy is numbered with an odd number The buoy is red in color The buoy should be left to port when entering from seaward All of the above.
Under the U.S. Aids to Navigation System, what does a lighted buoy with a spherical topmark mark indicate? The position of underwater cables A hazard to navigation Safe water The port side of the channel
Under the U.S. Aids to Navigation System, which category is a yellow buoy? A safe water buoy A special purpose mark A junction buoy A cardinal mark
Which characteristic and color will a preferred-channel buoy show? A group-occulting white light A composite group-flashing (2 + 1) white light A white light whose characteristic is Morse (A) A composite group-flashing (2 + 1) red or green light
Which characteristic will a lighted buoy that is to be left to starboard, when entering a U.S. port from seaward have? A light characteristic of Morse (A) A white light A red light A green light
Which characteristics will a lighted buoy that is to be left to starboard, when entering a U.S. port from seaward have? A light characteristic of Morse (A) A white light A red light A green light
On entering from seaward, which is TRUE of a starboard side daymark? It shows a fixed red light if lighted It show a Morse (A) white light It will be square in shape It will have an even number if numbered
When entering from seaward, what does a buoy displaying a composite group (2+1) flashing red light indicate? A wreck to be left on the vessel's port side A junction with the preferred channel to the left A sharp turn in the preferred channel to the right The starboard side of the secondary channel
Which is TRUE of a lateral system buoy displaying a quick flashing light? The buoy should be passed close aboard on either side The buoy is painted with red and white vertical stripes The buoy is used at a channel bifurcation or junction The buoy indicates that special caution is required
Which is TRUE of an alternating light? It marks an alternate lesser used channel It shows a light that changes color It is used as a replacement for another light It shows a light with varying lengths of the lighted period
Which is a characteristic of a port side daymark? Black and white Numbered Of any shape Octagonal
Which is TRUE of an occulting light? There is only a partial eclipse of the light The period of light exceeds the period of darkness The periods of light and darkness are equal The period of darkness exceeds the period of light
Which would be the characteristic of an occulting light? 4 sec. flash, 2 sec. eclipse, 3 sec. flash, 2 sec. eclipse 6 sec. flash, 6 sec. eclipse 1 sec. flash, 2 sec. eclipse, 1 sec. flash, 5 sec. eclipse 5 sec. flash, 5 sec. eclipse
A cardinal mark showing an uninterrupted quick-flashing white light indicates the deepest water is located in which quadrant? The east quadrant of the mark The north quadrant of the mark The south quadrant of the mark The west quadrant of the mark
In United States waters, a buoy having red and white vertical stripes if lighted, it will have which light characteristic? Morse (A) Quick flashing Group occulting Interrupted quick flashing
What is the characteristic of a quick flashing light? Shows not less than 60 flashes per minute Shows quick flashes for about 5 seconds followed by a 1 second dark period Durations of light and darkness are equal Shows groups of 2 or more flashes at regular intervals
Under the IALA-A Buoyage system, a buoy marking the port hand of the channel when approaching from seaward may NOT have which feature? A red light A square topmark A group-flashing light A conical shape
How are you informed of defects or changes in aids to navigation? Marine Safety Information Website Weekly Notice to Mariners Local Notice to Mariners All of the above.
What does a white buoy with an orange rectangle on it indicate? Danger General information A controlled area An exclusion area
Which is TRUE of a nun buoy in the IALA Region B system of buoyage? It will be green in color It will be left to port when entering from seaward It will be cylindrical in shape It will have an even number
Light List indicates that a light has a nominal range of 14 miles and is 42 feet high (12.8 meters). If the visibility is 6 miles and your height of eye is 20 feet (6.1 meters), at what approximate distance will you sight the light? 20.1 miles
10.0 miles
7.6 miles
6.0 miles
You are heading out to sea in a buoyed channel and see a quick-flashing green light on a buoy ahead of you. In U.S. waters, you should leave the buoy __________.
about 50 yards off on either side
to port
well clear on either side

to starboard
A lateral system buoy displaying a quick light __________. indicates that special caution is required is used at a channel bifurcation or junction should be passed close aboard on either side is painted with red and white vertical stripes
As you enter a channel from seaward in a U.S. port, the numbers on the starboard side buoys __________. decrease and the buoys are red increase and the buoys are red increase and the buoys are green decrease and the buoys are black
A lighted buoy to be left to starboard, when entering a U.S. port from seaward, shall have a __________. green light white light red light light characteristic of Morse
You are steaming southward along the west coast of the United States when you encounter a buoy showing a flashing red light. Which is TRUE concerning the buoy?__________. The buoy can remain on either side close aboard
The buoy should be left on the vessel's starboard side
The buoy can be on either side well clear
The buoy should be left on the vessel's port side
You are steaming southward along the west coast of the United States when you encounter a buoy showing a flashing red light. The buoy should be left on __________. either side close aboard either side well clear the vessel's starboard side the vessel's port side
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? Leave it to your port. Pass it about 50 yards off on either side. Pass it well clear on either side. Leave it to your starboard.
"Proceeding from seaward" for the purpose of the direction of buoying offshore, lateral system buoys would be proceeding __________. northerly on the Atlantic Coast northerly on the Pacific Coast easterly on the Gulf Coast None of the above
You are steaming in a westerly direction along the Gulf Coast. You see ahead of you a lighted buoy showing a red isophase light. Which action should you take? Alter course and leave the buoy near by on either side. Alter course to port and leave the buoy to starboard. Alter course to starboard and leave the buoy to port. Alter course and pass the buoy well-off on either side.
You are steaming southward along the west coast of the United States when you sight a buoy showing a flashing green light. How should you pass this buoy? Leave it to your starboard. Leave it to your port. Pass it close aboard on either side. Pass it on either side but well clear of it.
A nun buoy will __________. be left to port when entering from seaward be green in color have an even number be cylindrical in shape
As you enter a U.S. channel from seaward the numbers on the buoys __________.
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
increase with the can buoys being even numbered
A white buoy with an open-faced orange diamond on it indicates __________. the buoy is a mooring buoy operating restrictions are in effect vessels are excluded from the area danger
A white buoy with an orange circle marked on it indicates __________. danger operating restrictions are in effect vessels are excluded from the area a mooring buoy
A white buoy with an orange cross within a diamond marked on it indicates __________. danger operating restrictions are in effect an anchorage area vessels are excluded from the area
An orange and white buoy marking a danger area will have what symbol on it? Diamond with a cross Open-faced diamond Square Circle
An orange and white buoy marking an area where operating restrictions are in effect will be marked with which symbol? Circle Open-faced diamond Diamond with a cross Rectangle
An orange and white buoy indicating a vessel-exclusion area will be marked with what symbol? Open-faced diamond Diamond with a cross Square Circle
A white buoy with an orange rectangle on it is used to indicate __________. a controlled area general information danger an exclusion area
An orange and white buoy with a rectangle on it displays __________. distances directions locations All of the above.
A buoy marking a wreck will show a(n) __________. continuous quick white light and may be numbered white light FL (2) and a topmark of 2 black spheres occulting green light and may be lettered yellow light and will be numbered
Buoys which mark isolated dangers are painted with alternating __________. green and black bands green and white bands red and white stripes red and black bands
Under the IALA-B Buoyage System, when entering from seaward a lateral system buoy to be left to port may display which of the topmarks shown? Illustration D046NG A B C D
Under the IALA-B Buoyage System, when entering from seaward a lateral system buoy to be left to starboard may display which of the topmarks shown? Illustration D046NG A B C D
What does a buoy with a composite group-flashing light indicate? Bifurcation (channel junction) Dredging area Fish net area dredging area
A buoy having red and green horizontal bands would have a light characteristic of __________. Morse quick flashing composite group flashing interrupted quick flashing
A preferred-channel buoy will show a __________. white light whose characteristic is Morse composite group-flashing (2 + 1) red or green light composite group-flashing (2 + 1) white light group-occulting white light
A lighted preferred-channel buoy may show a __________. fixed red light Morse (A) white light yellow light composite group-flashing light
A preferred-channel buoy may be __________. lettered spherical showing a white light All of the above.
While proceeding along the Mediterranean coast of Spain, you sight the black and yellow buoy shown in illustration D020NG below. Your course is 039°T, and the buoy bears 053°T. What action should you take? Alter course towards the buoy and leave the buoy well clear on either side
Maintain course and ensure that the bearings increase
Alter course to 060° and ensure that the bearings decrease
Alter course to 053°T and pass the buoy close aboard on either side
While proceeding along the Norwegian coast on course 039°T, you sight the black-yellow-black banded buoy shown in illustration D021NG below, bearing 053°T. What action should you take? Alter course to 053° and leave the buoy close aboard on either side Alter course to port to rapidly open the bearing to the right Maintain course Alter course to 060° and ensure that the true bearings decreases
Which cardinal quadrant is represented by the topmark in illustration D024NG below? Southern Northern Eastern Western
You are underway on course 127°T. You sight a buoy with the topmarks shown in illustration D025NG below, bearing two points on the starboard bow. Which action must be taken?
Ensure the bearings change to the right.
Alter course to starboard until the buoy is at least two points on the port bow, then hold course.
Alter course to port until the buoy is broad on the starboard quarter, then hold course.
Change course to have the buoy close aboard either side.
On a voyage along the coast of France, you sight a buoy with the top marks as shown in illustration D026NG below. How should you steer your vessel? west of the buoy south of the buoy east of the buoy north of the buoy
While steaming north of the Irish coast, you sight a buoy which shows the light rhythm shown in illustration D028NG below. How would you pass this buoy? South of the buoy West of the buoy North of the buoy East of the buoy
During daylight hours black double-cone topmarks are the most important feature of cardinal marks. Which of the four topmarks shown in illustration D030NG below indicates the best navigable water lies to the west of the buoy? A B C D
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 in illustration D030NG below would be fitted to this buoy? A B C D
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 in illustration D030NG below would be fitted to the buoy?
A  B

C  D
In the North Sea area, you sight a buoy with a quick light showing 3 flashes every 10 seconds. Which topmark in illustration D030NG below would be fitted to this buoy under the IALA Buoyage Systems? A B C D
In the North Sea area, you sight a buoy showing an uninterrupted quick-flashing white light. Which of the four topmarks shown in illustration D031NG below will this buoy be fitted with under the IALA Buoyage system? A B C D
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 in illustration D031NG below would be fitted to the buoy? A B C D
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 in illustration D031NG below would be fitted to this buoy? A B C D
While preparing to enter a Brazilian port (IALA-B), you see ahead a red and green horizontally striped buoy. The upper band is red. What action should you take? Pass the buoy close aboard on either side. Pass the buoy well clear on either side. Alter course to leave the buoy to port. Alter course to leave the buoy to starboard.
In illustration D044NG below, a pillar buoy is indicated by which letter? A B C D
In illustration D044NG below, what type of buoy is indicated by the letter A? pillar can spar nun
In illustration D044NG below, what type of buoy is indicated by the letter D? spar can pillar nun
In which country would you expect the channels to be marked with the IALA-B Buoyage System? Saudi Arabia Peru Poland Morocco
In which country would you expect the channels to be marked with the IALA-B Buoyage System? Brazil Norway New Zealand Tanzania
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
You are in a buoyed channel at night and pass a lighted buoy with an irregular characteristic. You should report this to the __________. National Ocean Service harbor master Coast Guard Corps of Engineers
The IALA Buoyage Systems do NOT apply to __________.
areas in which navigation may be subject to regulation
natural dangers and other obstructions, such as wrecks

lighthouses and lightships the sides and centerlines of navigable channels
Lighted information markers show __________. white lights green lights yellow lights red lights
The Coast Guard Captain of the Port has excluded all traffic from a section of a port, while a regatta is taking place. The buoys marking this exclusion area will be __________. orange and white nun- or can-shaped to conform to the overall direction o marked with a spherical topmark yellow
Navigational marks used for informational or regulatory purposes are __________. white with orange geometric shapes solid yellow green and red horizontally-banded red and white vertically-striped
White and orange buoys, if lighted, show which color light? Orange White Red Alternating yellow and white
Information markers, when lighted, will display __________. red lights green lights white lights yellow lights
White lights may be found on __________. special purpose buoys numbered buoys preferred channel buoys information and regulatory buoys
Lighted white and orange buoys must show which color light? White Orange Red Alternating yellow and white
Under the Uniform State Waterway Marking System a mooring buoy is painted __________. white with a blue band any color that does not conflict with the lateral system yellow white with a green top
A white buoy with a blue band is __________. a mooring buoy marking a restricted area an isolated danger mark a hydrographic data collection buoy
A mooring buoy, if lighted, shows which color light? Blue White Yellow Any color except red or green
You sight a spar buoy with the top mark shown in illustration D027NG below. You must take which of the following actions? pass to the east of the buoy pass to the south of the buoy pass to the north of the buoy keep well clear of the buoy and pass on either side
Which topmark shown in illustration D023NG below identifies an isolated danger? A B C D
You sight a buoy fitted with a double-sphere topmark. If sighted at night, this buoy would show a __________. quick-flashing green light quick-flashing red light flashing white light showing a group of two flashes flashing red light showing a group of three flashes
What is the light phase characteristic of a lighted isolated-danger mark? Very quick flashing Interrupted quick flashing Long flashing Group flashing
Buoys which only mark the left or right side of the channel will never exhibit a light with which characteristic? Equal interval (isophase) Quick flashing Composite group flashing Flashing
In the U.S. Aids to Navigation System, lateral aids as seen entering from seaward will display lights with which characteristic? Quick Flashing Flashing Occulting All of the above.
Unlighted, red and green, horizontally-banded buoys with the topmost band red ________ may either be cylindrical or conical since the shape has no significance
are conical in shape and called nun buo are cylindrical in shape and called can buo are triangular in shape to indicate that it may not be possible to pass on either side of the buoy
Which buoy is NOT numbered? Green gong buoy Green can buoy Red lighted buoy Preferred-channel buoy
Which buoy will NOT display white retro reflective material? Safe water mark Preferred channel mark Isolated danger mark Daymark of no lateral significance
When approaching a preferred-channel buoy, the best channel is NOT indicated by the __________. color of the uppermost band light characteristic shape of an unlighted buoy color of the light
When a buoy marks a channel bifurcation, the preferred channel is NOT indicated by __________.
the light color of a lighted buoy
the shape of an unlighted buoy

whether the number is odd or even the color of the topmost band
Preferred channel buoys indicate the preferred channel to transit by __________. odd or even numbers the color of their top band the buoy's light rhythms the location of the buoy in the channel junction
In the U.S. Aids to Navigation System, red and green horizontally-banded buoys mark __________. fishing grounds general anchorage areas junctions or bifurcations channels for shallow draft vessels
Red lights may appear on __________. vertically striped buoys yellow buoys spherical buoys horizontally banded buoys
Green lights may appear on __________.
horizontally banded buoys
spherical buoys
vertically striped buoys
yellow buoys
Your vessel is leaving New York harbor in dense fog. As the vessel slowly proceeds toward sea, you sight a green can buoy on the starboard bow. Which action should you take? Turn hard right to get back into the channel. Stand on, leaving the buoy to your starboard. Pass the buoy close to, leaving it to your port. Stop and fix your position.
When entering from seaward, a buoy displaying a composite group (2+1) flashing red light indicates __________. the starboard side of the secondary channel a junction with the preferred channel to the left a wreck to be left on the vessel's port side a sharp turn in the preferred channel to the right
When entering from seaward, a buoy displaying a single-flashing red light indicates __________. a wreck to be left on the vessel's port side a sharp turn in the channel to the right a junction with the preferred channel to the left the starboard side of the channel
When entering from seaward, a buoy displaying a single-flashing red light indicates __________. the starboard side of the channel a sharp turn in the channel to the right a junction with the preferred channel to the left a wreck to be left on the vessel's port side
When outbound from a U.S. port, a buoy displaying a flashing red light indicates __________. a sharp turn in the channel to the right a junction with the preferred channel to the left the port side of the channel a wreck to be left on the vessel's starboard side
Which buoy may be even numbered? Unlighted nun buoy Lighted green buoy Mid-channel buoy All of the above.
Which buoy may be odd numbered? A yellow buoy A red buoy A spherical buoy An unlighted can buoy
Which buoy may be odd numbered? Unlighted nun buoy Lighted green buoy Mid-channel buoy All of the above.
When entering a channel from seaward, the numbers on buoys __________. increase with the even numbers to starboard decrease with the odd numbers to starboard are marked in 6 inch figures with retroreflective material are the same as their Light List number
What indicates a buoy that should be left to port when entering from seaward?
(U.S. Aids to Navigation System)
Odd number White light Group flashing characteristic Nun shape
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.
A preferred-channel buoy displays either red or green reflective material to agree with the top band of color.
A special-purpose mark will display either red or green reflective material to agree with its shape.
All reflective material is white because it is the most visible at night.
In the IALA Buoyage System, what are buoys with alternating red and green horizontal bands used to indicate? spoil grounds fishing areas the preferred channel isolated dangers
In the IALA Buoyage System, preferred-channel-to-port or preferred-channel-to starboard buoys, when fitted with lights, will show a __________. long flashing light quick flashing light group flashing composite group flashing (2 + 1) light
Under the IALA-B Buoyage System, a buoy displaying a red light will __________. show a light characteristic of Morse Code "A" have a radar reflector be left to starboard when entering from seaward be lettered
Under the IALA-B Buoyage System, a conical buoy will be __________. red in color numbered with an odd number left to port when entering from seaward All of the above.
Under the IALA-B Buoyage System, when entering from seaward, a buoy that should be left to port will be __________. yellow green black red
While steaming on course 280°T, you sight a buoy showing a very quick-flashing (VQ) white light well to port. Maintaining course, you sight another buoy showing a quick-flashing (Q) white light. You should pass __________.
south of the buoy
east of the buoy
west of the buoy

north of the buoy
You are underway on course 142°T when you sight a buoy bearing 105°T. The buoy's white light has a characteristic of continuous very-quick flashing. To ensure that your vessel remains in the best navigable water you would __________.
alter course to port and pass the buoy close aboard to either side
continue on course and ensure that the bearings change to the left pass between the buoy and another buoy showing a fixed white light

alter course to port and pass north of the buoy
You are underway in the North Sea on course 216°T when you sight a buoy bearing 021° relative. Under the IALA Buoyage System, you are in the best navigable water if the buoy __________. has a continuous very quick light has a double cone topmark with both points up is horizontally banded yellow, black, yellow has a light characteristic of Q(6) + L Fl 15s
You are underway on course 328°T when you sight a buoy broad on your port bow. You are in the best navigable water if the buoy __________. exhibits a light with the characteristic of VQ(3)5s is a western quadrant buoy is painted yellow on the top half and black on the bottom has a topmark of two cones with points down
The characteristic of a lighted cardinal mark may be __________. occulting very quick flashing fixed flashing
What is a characteristic of cardinal marks? Light rhythms indicating directional orientation Square or triangular topmarks Vertical stripes Number-letter combinations for identification
You are on course 090°T when you sight a flashing white light with a characteristic of VQ(9)10s. You immediately change course to 030°T. After one hour, you sight another flashing white light with the characteristic of VQ. You must pass well __________.
south of this buoy
east of this buoy
west of this buoy

north of this buoy
What is NOT a characteristic of cardinal marks?
White lights
Directional orientation to a hazard
Yellow and black bands

Square or triangular topmarks
Two navigational hazards are located near to each other, but each is marked by an individual cardinal buoyage system. The buoys of one cardinal system may be identified from the other system by __________. the difference in the periods of the light the differing light colors one system using horizontal bands while the other system uses vertical stripes one system having odd numbers while the other system has even numbers
You are steaming along the coast of Ireland in the Irish Sea. You sight a lighted buoy with a white flashing light showing a group of two flashes. The buoy indicates you __________. must pass the buoy close to starboard must pass south of the buoy must pass north of the buoy should pass well clear on either side of the buoy
Under the IALA Buoyage Systems, a cardinal mark may NOT be used to __________.
indicate the port and starboard sides of well-defined channels
indicate the safe side on which to pass a danger
indicate that the deepest water in an area is on the named side of the mark
draw attention to a feature in the channel such as a bend, junction, bifurcation, or end of a shoal
In waters where the cardinal system is used you would expect to find danger __________. lying to the east of an eastern quadrant buoy lying to the south of an eastern quadrant buoy beneath or directly adjacent to the buoy lying to the south of a northern quadrant buoy
A cardinal mark showing an uninterrupted quick-flashing white light indicates the deepest water in the area is on the __________. south side of the mark north side of the mark east side of the mark west side of the mark
Under the IALA cardinal system, a mark with a quick white light showing 6 flashes followed by one long flash indicates that the safest water is on the __________. north side of the mark south side of the mark east side of the mark west side of the mark
Under the IALA cardinal system, a mark with quick white light showing 3 flashes every 10 seconds indicates that the safest water in the area is on the __________. east side of the mark west side of the mark north side of the mark south side of the mark
Under the IALA cardinal system, a mark with a quick light showing 9 flashes every 15 seconds indicates that the safest water is on the __________. west side of the mark east side of the mark south side of the mark north side of the mark
On approaching the English Channel on course 080°T, you note the symbol YBY near a charted buoy. You must pass __________. southward of the buoy eastward of the buoy westward of the buoy northward of the buoy
Under the IALA-A Buoyage System, when entering from seaward a lateral system buoy to be left to starboard may display which topmark shown in illustration D046NG below? A B C D
Under the IALA-A Buoyage System, when entering from seaward a lateral system buoy to be left to port may display which topmark shown? Illustration D046NG A B C D
You are entering an African port and see ahead of you a red can-shaped buoy. What action should you take? Pass the buoy close aboard on either side Alter course to leave the buoy to starboard Pass the buoy well clear on either side Alter course to leave the buoy to port
Under the IALA-A Buoyage System, a green spar buoy with a triangular topmark would indicate that the buoy __________. is on the north side of a point of interest may be left close aboard on either side should be left to port when heading out to sea is marking the preferred channel
Under the IALA - A Buoyage System, a buoy used as a port hand mark would not show which light characteristic? Long flashing Isophase Quick flashing Group Flashing (2 + 1)
Under the IALA-A Buoyage system, a buoy marking the starboard side of the channel when approaching from seaward may have a __________. red light can shape triangular topmark isophase light
IN REGION A of the IALA Buoyage System, when entering from seaward, the starboard side of a channel would be marked by a __________. green can buoy red conical buoy green conical buoy red can buoy
Under the IALA-A Buoyage system, a buoy marking the port hand of the channel when approaching from seaward may NOT have a __________. red light group-flashing light square topmark conical shape
Under the IALA-A Buoyage System, a buoy indicating the preferred channel is to port would have __________. an odd number a pillar shape an even number horizontal bands
Under the IALA-A Buoyage System, a buoy indicating that the preferred channel is to port when entering from seaward, can have a __________. can shape group-flashing (2) light red-and-green vertical stripes green light
In Region A of the IALA Buoyage System, when entering from seaward, the port side of a channel would be marked by a __________. black conical buoy red can buoy black can buoy red conical buoy
Where would you expect to find channels marked with the IALA-A Buoyage System? Chile Australia the Philippines Republic of Korea
Where would you expect to find channels marked with the IALA-A Buoyage System? Canada Argentina India Japan
Under the IALA-A Buoyage System, when entering from seaward, a buoy indicating the preferred channel is to starboard may have a __________. conical shape square topmark green light long-flashing light characteristic
A safe water mark may be __________. vertically striped showing a white light spherical All of the above.
A vertically-striped buoy may be __________. lighted with a white light striped black and green striped black and yellow lighted with a red light
A mid-channel buoy, if lighted, will show a __________. Morse white light flashing red light fixed red light
A spherical buoy may be __________. numbered green red lettered
Of the four light characteristics shown in illustration D019NG below which one does NOT represent a safe water mark of the IALA Buoyage System? A B C D
Under the IALA Buoyage System, which topmark shown in illustration D023NG below will be displayed on a safe water mark? A B C D
Safe water buoys may show ONLY __________. flashing green lights yellow lights white lights flashing red lights
How is a safe water mark, that can be passed close aboard on either side, painted and lighted?
Black and red stripes with a Morse (A) light Black and red stripes with an interrupted quick flashing light
Black and white stripes with an interrupted quick flashing light
Red and white stripes with a Morse (A) light

The light rhythm of Morse (A) is shown on __________. starboard- or port-side buoys
special marks
safe water buoys
preferred-channel buoys
In United States waters, a buoy having red and white vertical stripes has a light characteristic of __________. group occulting interrupted quick flashing quick flashing Morse (A)
Which navigational mark may only be lettered? An unlighted, green, can buoy A spherical buoy A red buoy A port side day-shape
What is a lighted safe water mark fitted with to aid in its identification? A spherical topmark Red and white retroreflective material A red and white octagon A sequential number
What is a lighted safe water mark fitted with to aid in its identification?
A red and white octagon
Red and white retroreflective material
A sequential number

A spherical topmark
Under the U.S. Aids to Navigation System, a lighted buoy with a spherical topmark marks __________. safe water the position of underwater cables a hazard to navigation the port side of the channel
You are outbound in a buoyed channel on course 015°T. You sight a white light showing a Morse characteristic bearing 359° relative. For safety, you should __________. alter course to 000°T and leave the buoy well clear to starboard check the chart to see where the marked danger lies in relation to the buoy stay in the channel and leave the buoy to port change course to 359°T to pass near to the buoy
Under the IALA Buoyage Systems, safe water marks may show a __________. composite group-flashing, Fl(2 + 1), green light white Morse (A) light quick-flashing, Q(9)15s, white light composite group-flashing, Fl(2 + 1), red light
In the IALA Maritime Buoyage System, what is a red and white vertically-striped buoy used to indicate? cardinal mark safe water mark special mark not primarily used for navigation isolated danger mark
Under the IALA-A and B Buoyage Systems, a buoy with alternating red and white vertical stripes indicates __________. that the preferred channel is to port that the preferred channel is to starboard that there is navigable water all around an isolated danger exists
Under the IALA Buoyage Systems, a safe water mark may NOT __________.
show a quick flashing light be lettered display a white light be spherical
Under the IALA Buoyage Systems, a spherical buoy will mark the __________.
safe water port side of the channel a hazard to navigation the position of an underwater cable
Under the IALA Buoyage Systems, the topmark of a red and white vertically-striped buoy shall be __________. two black spheres a single red sphere X-shaped a single red cone
A special mark (yellow buoy), if lighted, may exhibit which light rhythm?
Morse "A"
Equal interval

Flashing Occulting
A special purpose buoy shall be __________. striped black and red lighted with a red light yellow lighted with a white light
A survey (special purpose mark) buoy __________. may have a flashing red light must be lighted may have a fixed white light None of the above
Buoys which mark dredging areas are painted __________. red yellow green black
In both regions of the IALA buoyage system, which topmark shown in illustration D022NG below is used on a special mark? A B C D
Under the U.S. Aids to Navigation System, a special mark possesses which of the following characteristics? May show a light with the Morse code "A" rhythm Must be lighted with a fixed or flashing white light May show a yellow light with a flashing rhythm Must be lighted with a yellow isophase light
Which light characteristic may be used on a special purpose mark? Occulting Equal interval Fixed Quick flashing
Which light characteristic may be used on a special purpose mark? Occulting Equal interval Flashing Quick flashing
Which of the buoys listed below could be used to mark an anchorage? White buoy numbered "3" Yellow buoy lettered "N" White buoy with a green top White buoy with orange bands
Under the U.S. Aids to Navigation System, a yellow buoy is a __________. junction buoy safe water buoy cardinal mark special purpose mark
You have been informed that dredging operations may be underway in your vicinity. Which buoy indicates the dredging area? Yellow and black vertically-striped buoy White and international orange buoy White buoy with a green top Yellow buoy
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 spherical in shape A topmark consisting of two cones with the points up A topmark triangular in shape Lettering on the buoy
Yellow lights may appear on __________. spherical buoys vertically-striped buoys special purpose buoys horizontally-banded buoys
Under the IALA Buoyage Systems, a yellow buoy may mark __________. military exercise zones spoil areas fish net areas All of the above.
In the U.S. Aids to Navigation System on the Western Rivers, the light characteristic of group flashing (2) is used for lights on __________. preferred channel buoys the right descending bank the left descending bank daymarks with no lateral significant
The light characteristic of flashing is used in the Aids to Navigation System on the Western Rivers for lights on __________. the right descending bank daymarks with no lateral significance preferred channel buoys the left descending bank
The light characteristic of composite group flashing (2 + 1) is used in the Aids to Navigation System on the Western Rivers for lights on __________. daymarks with no lateral significance the right descending bank the left descending bank preferred-channel buoys
Under the U.S. Aids to Navigation System used on the Western Rivers, aids to navigation lights on the right descending bank show __________. white or red lights white or green lights green lights only white lights only
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 __________. red can buoys green nun buoys red nun buoys green can buoys
Under the U.S. Aids to Navigation System on the Western Rivers, the buoys marking the starboard side of the channel when going upstream will be __________. yellow green black red
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 a characteristic of composite group flashing if lighted show a red light if lighted have the upper band red All of the above.
Under the U.S. Aids to Navigation System on the Western Rivers, a preferred-channel buoy is __________. solid green vertically-striped red and white horizontally-banded red and green solid red
You are in a channel inbound from sea. A daymark used to mark a channel junction, when the preferred channel is to port will have the shape indicated by what letter in illustration D045NG below? A B C D
In illustration D045NG below, a green-and-red banded daymark, with the uppermost band green, will have which of the following shapes? A B C D
You are in a channel inbound from sea. A daymark used to mark a channel junction when the preferred channel is to starboard will have the shape indicated by what letter in illustration D045NG below? A B C D
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 below? A B C D
A triangular daymark would be colored __________. green red and white red green and white
A red triangular daymark marks __________. an area of a channel where passing another vessel is permitted the starboard side of a channel a prominent object of navigational interest that has no lateral significance the centerline of a navigable channel
What feature(s) of a daymark is (are) used to identify the beacon upon which it is mounted? Color and shape Method of construction Size Signal characteristics
In illustration D045NG below, what two shapes shown are used to indicate a preferred channel? A and B
C and D
B and C

A and D
In illustration D045NG below, which shape is a daymark warning of danger? A B C D
A daymark used as a special mark is indicated by which letter in illustration D045NG below? A B C D
A white diamond daymark with an orange border is a(n) __________. information or regulatory mark lateral aid on the intracoastal waterway safe water mark special mark
The Light List indicates that a dayboard is a type KGW. You should __________. look for another daymark to form the range see a green and white diamond pass it close aboard on either side leave it to port when southbound on the Atlantic Coast ICW
The Light List indicates that a dayboard is a type MR. You should __________. look for an all red daymark leave it on either side check to enter the correct channel at this junction daymark look for the other dayboard forming the range
The Light List indicates that a dayboard is a type NB. You should __________. check to enter the correct channel at the junction daymark expect a daymark of no lateral significance look for another daymark forming a range see a black triangle
A daymark used to indicate the safe water in a channel will have which of the shapes shown in illustration D045NG below? A B C D
A safe water daymark has what shape? Triangular Diamond Octagonal Circular
A special daymark is a __________. yellow diamond green square red-and-white octagon daymark with a yellow stripe on it
The Light List indicates that a dayboard is a type TR-SY. You should __________. expect a daymark with no lateral significance leave it to port when southbound on the Atlantic portions of the ICW look for a dayboard of type TR-TY to form a range pass it close aboard on either side
On entering from seaward, a starboard side daymark will __________. have an even number if numbered  be square in shape  show a fixed red light if lighted show a Morse (A) white light
Entering from seaward, triangular-shaped daymarks are used to mark __________. the centerline of the channel special purpose areas the starboard side of the channel an obstruction where the preferred channel is to starboard
Daymarks marking the starboard side of the channel when going towards the sea are __________. red squares green squares red triangles green triangles
Port side daymarks may be __________. black and white numbered of any shape octagonal
Which type of daymark is used to mark the port side of the channel when entering from sea? Black and white diamond Red and white octagon Red triangle Green square
Which type of daymark is used to mark the starboard side of the channel when entering from sea? Red and white octagon Black and white diamond Red triangle Green square
What are the colors of a mid-channel daymark?
Green and white
Black and red
Green and red

Red and white
What daymark has NO lateral significance? Green square Green and white diamond Red triangle with a green horizontal stripe Red triangle
Which daymark has no lateral significance? Red triangle Square; top half green and bottom half red Green square Black and white diamond
What daymark shape is used in the lateral system? Pentagon Semicircle Triangle Diamond
Under the U.S. Aids to Navigation System on the Western Rivers, a daymark on the right descending bank will __________. indicate the gage reading be green have an odd number have yellow retroreflective markings
Under the U.S. Aids to Navigation System on the Western Rivers, passing daymarks on the right descending bank are __________. green square-shaped panels with green reflector borders red diamond-shaped panels with red reflector borders green triangular-shaped panels with green reflector borders red triangular-shaped panels with red reflector borders
If your vessel were proceeding down river (descending), a green square marker with a green reflector border on the right bank would be a __________. crossing daymark dredging mark mile board passing daymark
While proceeding downriver (descending) you sight a red diamond-shaped panel with small, red reflector squares in each corner on the left bank. Under the U.S. Aids to Navigation System on the Western Rivers this is a __________. passing daymark
cable crossing
special purpose signal
crossing daymark
Under the U.S. Aids to Navigation System on the Western Rivers, passing daymarks on the left descending bank are __________. green squares green diamonds red triangles red diamonds
While proceeding downriver, you sight a red triangular-shaped daymark on the left bank. Under the U.S. Aids to Navigation System on the Western Rivers this is a __________. special purpose signal passing daymark mark with no lateral significance crossing daymark
What indicates a dual purpose buoy? Green buoy with a yellow square Red buoy with a horizontal yellow band Red and white vertically-striped buoy with a red spherical topmark Red and white vertically-striped buoy with a vertical yellow stripe
You are entering an east coast port and see a buoy with a yellow triangle painted on it. What does the symbol indicate? you are in the vicinity of the ICW the buoy designates a sharp turn in the channel the buoy is off station the buoy is a special mark
A green buoy has a yellow triangle on it. This is a(n) __________. buoy that was set in error and will be replaced with a red nun buoy buoy that is off-station and is marked to warn mariners of its wrong position information or regulatory buoy that has lateral significance dual purpose marking used where the ICW and other waterways coincide
Buoys and day beacons exhibiting a yellow triangle or square painted on them are used __________. at particularly hazardous turns of the channel where the ICW and other waterways coincide on isolated stretches of the ICW to mark undredged areas in minor harbors where the controlling depth is 10 feet (3 meters) or less
When a dual purpose marking is used, the mariner following the Intracoastal Waterway should be guided by the __________.
color of the aid shape of the aid shape of the yellow mark color of the top band
You are sailing south on the Intracoastal Waterway (ICW) when you sight a red nun buoy with a yellow square painted on it. Which of the following is TRUE? This buoy marks the end of the ICW in that geographic area.
You should leave the buoy on your port hand.
The yellow is retro reflective material used to assist in sighting the buoy at night.
The yellow square is in error and it should be a yellow triangle.
You are sailing south on the Intracoastal Waterway (ICW) when you sight a red nun buoy with a yellow triangle painted on it. Which statement is TRUE?
The yellow triangle identifies a sharp turn (over 60°) in the channel.
Geometric symbols such as squares and triangles replace letters and numbers on ICW aids to navigation.

The ICW and another waterway coincide in this geographical area. This is an information or regulatory buoy that also has lateral significance.
You are sailing south on the Intracoastal Waterway (ICW) when you sight a red nun buoy with a yellow square painted on it. Which statement is TRUE?
The waterway in that area has shoaled and the available depth of water is less than the project depth.
The buoy is off station and should be ignored as a navigational mark.

You should leave the buoy to port. ICW traffic should not proceed beyond the buoy unless the crossing waterway is clear of all traffic.
You are sailing south on the Intracoastal Waterway (ICW) when you sight a green can buoy with a yellow square painted on it. Which of the following is TRUE? You should pass the buoy close aboard on either side. The yellow square is retro reflective material used to assist in sighting the buoy at night. You should leave the buoy to port. The buoy marks the end of the ICW in that area.
Aids to navigation marking the intracoastal waterway can be identified by __________. white retro reflective material the light characteristic and color for lighted aids yellow stripes, squares, or triangles marked on them the letters ICW after the aid's number or letter
What is the approximate geographic range of Fenwick Island Light, Delaware, if your height of eye is 42 feet (12.8 meters)? Refer to "Reprints from the LIGHT LISTS AND COAST PILOTS". 13.1 nm 10.3 nm 18.3 nm 15.4 nm
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).
20.8 nm
21.5 nm
18.4 nm

19.9 nm
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
What is the approximate geographic range of Horton Point Light, NY, if your height of eye is 40 feet (12.2 meters)? Refer to "Reprints from the LIGHT LISTS AND COAST PILOTS". 18.8 nm 19.3 nm 20.3 nm 24.8 nm
What is the approximate geographic range of Assateague Light, VA, if your height of eye is 52 feet (15.8 meters)? Refer to "Reprints from the LIGHT LISTS AND COAST PILOTS". 14.1 nm 21.8 nm 23.0 nm 50.2 nm
Your height of eye is 40 feet (12.2 meters). What is the approximate geographical distance at which Ambrose Light, NY, could be visible? Refer to "Reprints from the LIGHT LISTS AND COAST PILOTS". 22.8 nm 18.3 nm 21.0 nm 19.5 nm
What is the approximate geographic range of Race Rock Light, NY, if your height of eye is 27 feet (8.2 meters)? Refer to "Reprints from the LIGHT LISTS AND COAST PILOTS". 17.4 nm 9.9 nm 15.7 nm 14.3 nm
What is the approximate geographic range of Fenwick Island Light, Delaware, if your height of eye is 37 feet (11.6 meters)? Refer to "Reprints from the LIGHT LISTS AND COAST PILOTS". 24.8 nm 17.8 nm 15.9 nm 10.3 nm
What is the approximate geographic range of Point Judith Light, Rhode Island, if your height of eye is 62 feet (18.9 meters)? Refer to "Reprints from the LIGHT LISTS AND COAST PILOTS". (use charted range of 20 miles as nominal range) 9.6 nm 16.5 nm 18.6 nm 20.7 nm
What is the approximate geographic range of Shinnecock Light, NY, if your height of eye is 24 feet (7.3 meters)? Refer to "Reprints from the LIGHT LISTS AND COAST PILOTS". 8.7 nm 9.9 nm 14.4 nm 15.9 nm
What is the approximate geographic range of Southwest Ledge Light, Connecticut, if your height of eye is 32 feet (9.8 meters)? Refer to "Reprints from the LIGHT LISTS AND COAST PILOTS". 15.5 nm 13.4 nm 8.7 nm 6.9 nm
Geographic range is the maximum distance at which a light may be seen under __________.
existing visibility conditions, limited only by the intensity of the light
perfect visibility conditions, limited only by interference from background lighting

perfect visibility conditions, limited only by the curvature of the Earth existing visibility conditions, limited only by the curvature of the Earth
On a chart, the characteristic of the light on a lighthouse is shown as flashing white with a red sector. The red sector __________. is used to identify the characteristics of the light indicates the limits of the navigable channel serves no significant purpose indicates a danger area
A light having characteristics which include color variations is defined as __________. oscillati fluctuati switching

alternating
Which of the following traits possessed by an articulated light makes it superior to other types of buoys? The fog horn signal travels farther to sea The radar reflectors return better signals It is equipped with strobe lights It has a reduced watch circle
On navigational aids, what does the light characteristic "Fl(2+1)" mean? A flashing light combined with a fixed light of greater brightness A light showing groups of two or more flashes at regular intervals Light flashes combined in groups, with a different number of flashes in each group A fixed light varied at regular intervals by groups of two or more flashes of greater brightness
An alternating light __________. shows a light with varying lengths of the lighted period marks an alternate lesser-used channel is used as a replacement for another light shows a light that changes color
What is characteristic of an occulting light? 1 sec. flash, 2 sec. eclipse, 1 sec. flash, 5 sec. eclipse 4 sec. flash, 2 sec. eclipse, 3 sec. flash, 2 sec. eclipse 5 sec. flash, 5 sec. eclipse 6 sec. flash, 6 sec. eclipse
A light that has a light period shorter than its dark period is described as __________. alternating pulsating occulting flashing
An occulting light is one in which __________. the period of light exceeds the period of darkness the period of darkness exceeds the period of light the periods of light and darkness are equal there is only a partial eclipse of the light
What is characteristic of an isophase light? 6 sec. flash, 3 sec. eclipse 4 sec. flash, 2 sec. eclipse, 3 sec. flash, 2 sec. eclipse 2 sec. flash, 5 sec. eclipse 1 sec. flash, 1 sec. eclipse
What is the characteristic of a quick light? Durations of light and darkness are equal Shows not less than 60 flashes per minute Shows groups of 2 or more flashes at regular intervals Shows quick flashes for about 5 seconds followed by a 1 second dark period
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 a vessel toward the light True bearings as observed from the light toward a vessel Bearings given in the Light List are always magnetic
Which item in illustration D034NG below shows a fixed and flashing light? A B C D
Which item in illustration D034NG below shows a flashing light? A B C D
Which item in illustration D034NG below shows an occulting light? A B C D
Which item in illustration D034NG below shows a Morse (A) light? A B C D
What is NOT true concerning color sectors of lights? Color sectors are expressed in degrees from the light toward the vessel. Color sectors may indicate a turning point in a channel. Color sectors may indicate the best water across a shoal. Color sectors may indicate dangerous waters.
Red sectors of navigation lights warn mariners of __________. floating debris heavily trafficked areas shoals or nearby land recently sunken vessels
You are underway and pass by a lighthouse. Its light, which was white since you first sighted it, changes to red. This means __________. you have entered an area of shoal water or other hazard the lighthouse has lost power and has switched to emergency lighting the light is characterized as alternately flashing it is the identifying light characteristic of the lighthouse
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
The time required for a lighted aid to complete a full cycle of light changes is listed in the Light List as the __________. function period frequency set
The period of a lighted aid to navigation refers to the __________. length of time between flashes of the lig date of construction or establishment

time required for the light to complete each cy time required for the longest flash of each cycle
The four standard light colors used for lighted aids to navigation are red, green, white, and __________.
purple
blue

yellow orange
What characteristics can be used to identify a lighthouse type of structu painted col light color and phase characteristic

All of the above.
When trying to sight a lighthouse you notice a glare from a town in the background. The range at which the light may be sighted due to this glare is __________. increased slightly due to extra lighting increased if the light is red or green due to contrast with the glare considerably reduced unchanged
The height of a light is measured from which reference plane? Mean high water Geographical sea level Mean low water Average water level
Which factor(s) is/are used to develop the charted information of a lighthouse? Height of the light only Height of the observer and the intensity of the light Height and intensity of the light Height of the light and the observer
Luminous range is the _________ maximum distance at which a light may be seen in clear weath maximum distance at which a light may be seen considering the height of the light and the height of the observer

maximum distance at which a light may be seen under existing visibility conditi average distance of visibility of the light
The luminous range of a light takes into account the ________ observer's height of eye
existing visibility conditio glare from background lighti elevation of the light
The maximum distance at which a light may be seen under existing visibility conditions is called __________. nominal range luminous range geographic range charted range
When a light is first seen on the horizon it will disappear again if the height of eye is immediately lowered several feet. When the eye is raised to its former height the light will again be visible. This process is called __________. checking a light raising a light

bobbing a light obscuring a light
The nominal range of a light may be accurately defined as the maximum distance at which a light may be seen __________. under perfect visibili under existing visibility conditions

with ten miles visibil with fifteen miles visibility
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
Drawbridges equipped with radiotelephones display a __________. white sign with the number 16 and the call sign on it day signal of a yellow diamond marked with the call sign blue and white sign showing the radio's channels black and white diamond marked with RT 16
The dumping of refuse in a lock is permitted __________. when approved by the lockmaster when locking downbound at no time during high water only
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
The following boats are approaching a lock. Which has priority for locking? Corps of Engineer towboat running empty-headed passenger vessel An integrated chemical tow An pleasure yacht
The following types of vessels are awaiting lockage on the upper Mississippi. Which type of vessel is normally passed through the lock first? Commercial towboats Commercial fishing vessels Pleasure craft Commercial passenger vessels
The lock chamber is 600 feet X 110 feet. Your towboat is 150 feet X 35 feet. Which of these tows will require a double lockage? 6 jumb(3 abreast and 2 long) with a standard on each side of your boat 9 jumbo barges 4 standard barges abreast next to your boat's head and 3 jumbo abreast in the lead A set-over single
In order to utilize the capacity of a lock to its maximum, pleasure craft are locked through with all of the following EXCEPT __________. cement barges sand barges oil barges coal barges
All persons or vessels within the lock area, including the lock approach channels, come under the authority of the __________. lockmaster dock captain lock foreman dockmaster
In addition to monitoring channel 16, all Corps of Engineer locks may use as working channels __________.
12, 13 and 14
 o
06, 12 and 22A
 o
01A, 05A and 07A
 o
14, 24 and 28
You are approaching a swing bridge at night. You will know that the bridge is open for river traffic when __________. the red light changes to green the red light is extinguished the amber light changes to green the fixed, green light starts to flash
Illustration D036NG below represents a fixed C of E lock and dam. What navigational light(s) is(are) exhibited at the position indicated by the letter D? Three green lights One red light Two green lights No light
Illustration D037NG below represents a movable dam. If there is high water and the wickets are down so that there is an unobstructed navigable pass through the dam, what light(s) will be shown at D if the lock walls and piers are not awash? Three red lights One amber light One red light Two red lights
Illustration D037NG below represents a movable dam. If there is high water and the wickets are down so that there is an unobstructed navigable pass through the dam, what light(s) will be shown at B if the lock walls and piers are not awash?
o
One amber light
Three red lights  Two red lights One red light
What lights would you see on the Illinois water way when any wickets of the dam or bear traps are open, or partially open, which may cause a set in the current conditions in the upper lock approach? Red over amber (yellow) Green over red Red over blue None of the above
The draw span of a floating drawbridge may be marked with __________. three red lights on each side of the dr flashing blue lights

a yellow diam two white lights
The draw span of a floating drawbridge may be marked with __________. flashing blue lights three red lights on each side of the draw a yellow and white diamond a yellow light showing Morse Code
You are approaching a multiple-span bridge at night. The main navigational channel span will be indicated by __________. a flashing green light in the center of the span a quick flashing red or green aid to navigation a steady blue light in the center of the span 3 white lights in a vertical line in the center of the span
The white lights in a vertical line on a multiple-span bridge indicate _________ the draw span is inoperab the river is obstructed under that sp scaffolding under the span is reducing the vertical clearance

the main channel
When displayed under a single-span fixed bridge, red lights indicate __________. the channel boundaries that vessels must stop that traffic is approaching from the other side the bridge is about to open
When the navigational channel passes under a fixed bridge, the edges of the channel are marked on the bridge with what lights?
Red lights
Yellow lights
Red lights on the LDB and green lights on the RDB
Three white lights in a vertical line
You are approaching a vertical lift bridge. You know the span is fully open when __________. three white lights in a vertical line are lit a yellow light is illuminated on the bridge pier a red light starts to flash at about 60 times a minute there is a range of green lights under the lift span
Which light combination does NOT indicate a navigational channel passing under a fixed bridge? Two green lights in a range under the span Red lights on the LDB and green lights on the RDB A fixed red light on each pier at the channel edge Three white lights in a vertical line
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
The channel under a bridge is marked with aids from the lateral system. The centerline of the channel is marked on the bridge with __________. a black-and-white diamond three white lights a yellow triangle a red-and-white octagon
The channel under a bridge is marked with lights of the lateral system. The centerline of the channel shall be marked on the bridge by __________. an occulting white light a flashing blue light three fixed white lights a yellow light
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? A strobe light visible both up and downstream Fixed amber lights under the extreme outer edges of the traveler A quick flashing red light at each lower corner Illumination by flood lights
In which publication could you find information concerning the minimum lighting required for bridges on U.S. waters?
Code of Federal Regulatio Mississippi River Systems Light Li Notice to Marine Chart No. 1.
You are upbound approaching a lock and dam and see two green lights in a vertical line. This indicates __________. the downstream end of the land wall the downstream end of an intermediate wall the navigable pass of a fixed weir dam that a double lockage is in progress
You are downbound approaching a lock and see 3 green lights in a vertical line. This indicates __________. that the lock chamber is open and ready to receive your tow that you should hold up until the signal changes to 2 green lights the upstream end of the land wall the upstream end of the river wall
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
You are approaching Gallipolis Lock and Dam. The traffic signal light is flashing red. You should __________. approach the lock slowly under full control proceed at normal speed to enter the lock hold your position and not attempt to enter the lock None of the above
A flashing red light displayed at a single lock means that the lock __________. cannot be made ready immediately and vessels shall stand clear is ready to use but vessels must stand clear is ready to use and vessels may approach cannot be made ready immediately but vessels may approach
You are approaching a lock and see a flashing amber light located on the lock wall. You should __________. approach the lock under full control hang off your tow on the lock wall enter the lock as quickly as possible stand clear of the lock entrance
Which light signal indicates that you may approach the lock? Flashing red Flashing amber Steady amber Steady green
Which light signal indicates that you have permission to enter a lock on the Ohio River? Steady red Flashing green Flashing amber Steady green
When approaching a lock entrance, the visual signal displayed when a single lock is ready for entrance is a flashing __________. red light green light amber light white light
A flashing green light displayed at a single lock means that the lock is __________. ready for entrance, but gates cannot be closed completely ready for entrance being made ready for entrance not ready for entrance
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 Five short blasts One prolonged blast followed by three short blasts
You are approaching a drawbridge and must pass through during a scheduled closure period. What signal should you sound? Three short blasts, two prolonged blasts Five short blasts Three prolonged blasts Two prolonged, two short blasts
You are approaching the first of two drawbridges that span a narrow channel. The second drawbridge is close to the first. Which signals should you sound? Sound the request-for-opening signal twice in succession to indicate you must pass through both bridg Sound the request-for-opening signal for the first bridge only, who will notify the second bridge of your approa Sound the request-for-opening signal, pause for about 10 seconds, then sound two prolonged blasts.

Sound the request-for-opening signal and, after the bridge acknowledges it, sound the request-for-opening signal for the second bridge.
You are approaching a drawbridge and have sounded the proper whistle signal requesting it to open. You hear a signal of one prolonged and one short blast from the bridge. Which action should you take Approach to a point not closer than 400 yards (360 meters) from the bridge and await further signal Hold in the channel as the bridge will open within 15 minutes.

Approach under full control to pass through the brid Anchor or use an alternate route because the bridge is out of service for an extended period of time.
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 fixed red light A flashing amber light A white flag raised and lowered vertically A flashing white light
You are approaching an open drawbridge and sound the proper signal. You receive no acknowledgment from the bridge. Which action should you take?
Approach with caution and proceed through the open draw.
Resound the opening signal and do not pass through the bridge until signals have been exchanged.
Approach under full control to a position no closer than 400 yards from the bridge and await a signal from the bridge.
Hold in the channel as a vessel is closing the bridge from the other direction.
You are approaching a drawbridge and have sounded the request-for-opening signal. The bridge has responded with five short blasts. How would you respond? Any of these signals is considered a valid reponse Five short blasts White flag raised up and down Confirm response on radiotelephone
When approaching a lock and at a distance of not more than a mile, vessels desiring a single lockage shall sound which signal? One long blast followed by one short blast Two short blasts One short blast followed by one long blast Two long blasts
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 long blast followed by one short blast One short blast followed by two long blasts One long blast followed by two short blasts Two long blasts followed by one short blast
Permission to enter the riverward chamber of twin locks is given by the lockmaster and consists of which sound signal? One long blast
Two long blasts Two short blasts One short blast
You are holding position above Gallipolis Lock and Dam when you hear two long blasts of the horn from the lock. This indicates that you should __________. hold position until two more upbound tows have locked through enter the riverward lock hold position until the lower gates are closed enter the landward lock
Permission to leave the riverward chamber of twin locks is given by the lockmaster and consists of which sound signal? One long blast Two long blasts Two short blasts One short blast
You are downbound on the Ohio River locking through Greenup. The chamber has been emptied and the lower gates are open. You hear one short blast of the whistle from the lock. You should __________. tie off to the guide wall until the river is clear of traffic hold up until another tow enters the adjacent lock leave the lock hold in the lock chamber due to a malfunction with the gate
What is the approximate geographic visibility of an object with a height above the water of 70 feet, for an observer with a height of eye of 65 feet? 16.8 nm 19.0 nm 20.6 nm 22.4 nm
The Light List indicates that a light has a nominal range of 13 miles and is 36 feet high. If the visibility is 17 miles and your height of eye is 25 feet, at what approximate distance will you sight the light? 10.0 miles 12.9 miles 14.2 miles 17.0 miles
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 mil 16.0 miles

19.0 mi 23.5 miles
The Light List indicates that a light has a nominal range of 13 miles and is 36 feet high (11.0 meters). If the visibility is 7.0 miles and your height of eye is 25 feet (7.6 meters), at what approximate distance will you sight the light? 10.0 miles 12.9 miles 14.2 miles 17.0 miles
The Light List shows that a navigational light has a nominal range of 12 miles and a height above water of 25 feet (7.6 meters). Your height of eye is 30 feet (9.1 meters) and the visibility is 0.5 mile. At what approximate range will you first sight the light? 12.0 miles 1.4 miles 0.5 mile 5.2 miles
The Light List indicates that a light has a nominal range of 14 miles and is 42 feet high (12.8 meters). If the visibility is 6 miles and your height of eye is 20 feet (6.1 meters), at what approximate distance will you sight the light? 20.1 miles 10.0 miles 7.6 miles 6.0 miles
The Light List shows that a navigational light has a nominal range of 17 miles and a height above water of 28 feet (8.5 meters). Your height of eye is 32 feet (9.8 meters) and the visibility is 11.0 miles. At what approximate range will you first sight the light?
15.7 miles
18.0 miles
12.6 miles
11.0 miles
The Light List indicates that a light has a nominal range of 14 miles and is 42 feet
(12.7 m) high. If the visibility is 16 miles and your height of eye is 20 feet (6.1 m), at which approximate distance will you sight the light?
7.6 miles 20.1 miles 16.0 miles 12.8 miles
The Light List shows that a navigational light has a nominal range of 22 miles and a height above water of 48 feet (14.6 meters). Your height of eye is 35 feet (10.7 meters) and the visibility is 20.0 miles. At what approximate range will you first sight the light? 32.0 nm 13.2 nm 14.7 nm 10.5 nm
The Light List indicates that a light has a nominal range of 20 miles and is 52 feet high. If the visibility is 12.0 miles and your height of eye is 20 feet, at what approximate distance will you sight the light? 21.5 miles 20.0 miles 13.7 miles 12.0 miles
The Light List shows that a navigational light has a nominal range of 19 miles and a height above water of 52 feet (15.8 meters). Your height of eye is 42 feet (12.8 meters) and the visibility is 10.0 miles. At what approximate range will you first sight the light? 16.0 miles 19.0 miles 10.0 miles 17.3 miles
The Light List indicates that a light has a nominal range of 20 miles and is 52 feet (16 meters) high. If the visibility is 20 miles and your height of eye is 20 feet (6 meters), at what approximate distance will you sight the light? 33.0 nm 20.0 nm 13.5 nm 8.5 nm
The Light List shows that a navigational light has a nominal range of 10 miles and a height above water of 38 feet (11.6 meters). Your height of eye is 52 feet (15.8 meters) and the visibility is 11.0 miles. At which approximate range will you first sight the light? 10.5 miles 13.9 miles 15.6 miles 18.0 miles
The Light List indicates that a light has a nominal range of 10 miles and is 11 feet high. If the visibility is 5 miles and your height of eye is 20 feet, at what approximate distance will you sight the light? 6.3 miles 7.4 miles 8.4 miles 9.0 miles
The Light List shows that a navigational light has a nominal range of 6 miles and a height above water of 18 feet (5.5 meters). Your height of eye is 47 feet (14.3 meters) and the visibility is 1.5 miles. At what approximate range will you first sight the light? 1.5 miles 2.0 miles 6.0 miles 12.7 miles
The Light List indicates that a light has a nominal range of 14 miles and is 26 feet high. If the visibility is 14 miles and your height of eye is 20 feet, at which approximate distance will you sight the light? 7.5 miles 11.2 miles 14.0 miles 18.1 miles
The Light List shows that a navigational light has a nominal range of 12 miles and a height above water of 25 feet (7.6 meters). Your height of eye is 38 feet (11.6 meters) and the visibility is 5.5 miles. At what approximate range will you FIRST sight the light?  5.5 miles
 o
6.3 miles

8.0 miles
o
12.0 miles
The Light List shows that a navigational light has a nominal range of 5 miles and a height above water of 21 feet (6.4 meters). Your height of eye is 32 feet (9.8 meters) and the visibility is 1.0 mile. At what approximate range will you first sight the light? 1.0 mile 1.5 miles 5.0 miles 11.7 miles
The Light List indicates that a light has a nominal range of 14 miles and is 26 feet high. If the visibility is 4 miles and your height of eye is 20 feet, at what approximate distance will you sight the light? 7.5 miles 9.6 miles 11.2 miles 14.0 miles
The Light List shows that a navigational light has a nominal range of 15 miles and a height above water of 29 feet (8.8 meters). Your height of eye is 52 feet (15.8 meters) and visibility is 6.0 miles. At which approximate range will you first sight the light? 8.0 miles 11.0 miles 14.5 miles 16.0 miles
The Light List indicates that a light has a nominal range of 18 miles and is 38 feet high. If the visibility is 6 miles and your height of eye is 15 feet, at which distance will you sight the light?
14.8 nm
18.0 nm
6.0 nm
11.7 nm
The Light List indicates that a light has a nominal range of 8 miles and is 48 feet(14.6 meters) high. If the visibility is 6 miles and your height of eye is 35 feet(10.7 meters), at what approximate distance will you sight the light? 8.0 nm 15.0 nm 12.4 nm 5.9 nm
The Light List shows that a navigational light has a nominal range of 18 miles and a height above water of 22 feet (6.7 meters). Your height of eye is 16 feet (4.9 meters) and the visibility is 2.0 miles. At which approximate range will you first sight the light? 2.0 miles 2.7 miles 4.2 miles 5.8 miles
The Light List shows that a navigational light has a nominal range of 6 miles and a height above water of 18 feet (5.5 meters). Your height of eye is 40 feet (12.2 meters) and the visibility is 27.0 miles. At which approximate range will you first sight the light? 5.6 miles 6.4 miles 9.8 miles 12.1 miles
The Light List shows that a navigational light has a nominal range of 15 miles and a height above water of 40 feet (12.2 meters). Your height of eye is 25 feet (7.6 meters) and the visibility is 5 miles. At about what range will you FIRST sight the light? 6.2 miles
9.5 miles
12.9 miles
14.2 miles