ATONS NK Flashcards
Learn ATONS
Special Marks are not intended to assist navigation.
T
A diamond shaped dayboard may be lettered.
T
Isolated Danger marks always have the double ball topmark and can be lettered.
T
An occulting light shows more off time in a period than a flashing light would.
F
A dayboard with the letter “J” marks a channel bifurcation.
T
A Special Mark does not have lateral significance, but is intended to assist in navigation.
F
The range of lights as listed in the Light List is the nominal range.
T
All marks that have lateral significance are numbered.
F
Green lights are shown on drawbridges to show when they are open.
T
All aids to navigation will be equipped with reflectve material to aid in identification.
F
A Morse Code light has appearances of light that are not of equal duration.
T
Isolated Danger Marks are green and red banded.
F
Sidemarks are only used to show the channel limits.
F
The purpose of aids to navigation exhibiting white or yellow lights may be determined by shapes.
T
A diamond shape having a cross centered within indicates that vessels are excluded from the area.
T
A yellow vertical band indicates that the marker is part of the ICW.
F
White lights have lateral significance on Western Rivers.
T
When not conducting drilling operations, oil well structures are usually marked with one or more fixed or quick flashing white or red lights, visible for two nautical miles.
F
A red lateral mark can have a light rhythm of quick flashing.
T
Letters are added to numbers as suffixes.
T
Markers in IALA Region A exhibit opposite shape significance.
F
Beacons may be floating aids to navigation.
F
An occulting light is a light in which the total duration of light in a period is longer than the duration of darkness.
T
Flashing lights have frequencies that do not exceed 60 flashes per minute.
F
Actual watch circles do not coincide with the symbol representing them on charts.
T
A red or green lateral mark shall be numbered or lettered.
F
Light sectors are given in bearings that are degrees true from the light to the observer.
F
Green aids to navigation have even numbers.
F
A single occulting light is an occulting light in which the light flash is regularly repeated.
F
A military excersise area would be marked by a regulatory mark.
F
Markers in IALA Region A exhibit opposite color significance.
T
If the first letter on a dayboard is “B”, this signifies that the dayboard is marking a junction or bifurcation.
F
A red or green lateral mark shall be numbered and can sometimes be augmented by letters.
T
Safe water marks can be lettered with the letters augmented by numbers.
F
An open faced diamond shape signifies danger.
T
Information concerning the location and characteristics of oil well structures which display lights and sound signals located in obstruction areas are listed in the NTM.
T
A special purpose mark shall be a can or a cone.
F
Green aids to navigation have odd numbers.
T
Information and Regulatory marks have orange geometric shapes against a white background.
T
A light that has only short flashes could be considered a Morse Code Light.
F
If the second letter on a dayboard is “G”, it indicates that the key color of the dayboard is green.
T
Ranges always have white lights.
F
Isolated Danger Marks would be black and red banded.
T
Numbers for red and green buoyage systems increase when proceeding from sea and going to port.
T
An occulting light is a light in which the total duration of light in a period is longer than the duration of darkness and the intervals of darkness are usually of equal duration.
T
A dayboard that has the letter “M” has lateral significance.
F
Isolated Danger marks always have the double ball topmark and are always lettered.
F
Ranges with colored lights have lateral significance.
F
Bearings on rangelines are given in degrees and minutes.
F
Information and regulatory marks, when lighted, display a yellow light with any rhythm except Mo A, quick flashing and flashing (2).
F
A safe water mark may be numbered or lettered.
F
Preferred channel marks often mark wrecks or obstructions.
T
A dayboard with the letter “J” does not have lateral significance.
F
A Special Mark has no navigational significance, but is intended to alert the marniner of a special feature in the area.
T
A solid red or green buoy must have a light.
F
Aids to navigation with lateral significance exhibit flashing, quick, occulting or isophase light rhythms.
T
The yellow markers for the ICW may appear on lateral marks with the opposite lateral significance.
T
A dayboard marked “JG-I” is a square dayboard, red and green striped with the top stripe green. It also has a yellow reflective strip.
T
A regulatory mark could have a light rhythm of quick flashing.
F
A daymark conveys, during daylight hours, the same significance as does the aid to navigation’s light at night.
T
A Special Mark is intended to alert the marniner of a special feature in the area.
T
A dayboard is marked “TR-TY.” This dayboard is a triangular red dayboard with a yellow triangle.
T
A yellow square indicates that the marker should be left to port when in the ICW.
T
A solid red or green buoy could mark a wreck or obstruction.
T
All LNB’s are equipped with RACONS.
F
While transiting the ICW, you sight a red buoy with a yellow square. This buoy should be left to starboard.
F
Shapes are laterally significant only when associated with a particular light rhythm.
F
A regulatory mark may have a light rhythm of flashing 4 s.
T
In the standard designation system for dayboards, the second lettter refers to the key color.
T
Numbers in a buoyage system increase by one at each buoy and do not skip numbers.
F
A group-occulting light is an occulting light which has a group of eclipses that are regularly repeated.
T
An Isolated Danger Mark would be used to mark a dredge pipeline.
F
An isophase light is a light in which all durations of light and darkness are equal.
T
A buoy that is used as a regulatory mark is white with two horzontal orange bands around the top and bottom.
T
Diamond shaped day-boards that have no lateral significance are divided into four diamond shaped sectors with the side sectors being white and the top sectors being red, green or or black.
T
The range of a light is listed in the light list for private aids to navigation, range lights and directional lights.
F
Buoy Positions represented on nautical charts are approximate positions.
T
Isolated Danger Marks are erected on or near an isolated danger.
T
A dayboard with the letter “J” may be a square or a triangle.
T
Safe water marks always have a topmark.
F
Isolated Danger Marks are always lighted.
F
In the Light List, the abbreviation “Q” means quick.
T
Light Rhythms can indicate the lateral significance.
F
A mark with lateral significance can have a white light.
F
It is not always possible to pass on either side of a preferred channel mark.
T
A daybeacon never has a light.
T
A green buoy can have a white or green light.
F
Numbers for red and green buoyage systems decrease when proceeding from port and going to sea.
T
A special mark may have a number.
F
Diamond shaped day-boards that have no lateral significance are divided into four square shaped sectors.
F
A dayboard that is marked on the chart “NY” is a diamond shaped dayboard, with a yellow border.
T
A yellow triangle indicates that the marker should be left to port when in the ICW.
F
A dayboard that has the letter “M” is a safe water mark.
T
When transiting the main channel you see a red buoy with a yellow triangle. If in the ICW, this marker should be left to port.
F
A lateral mark could have a flashing light.
T
Diamond shaped day-boards that have no lateral significance are divided into four diamond shaped sectors.
T
Lighted, sound, pillar and spar buoys have no shape significance.
T
If the first letter on a dayboard is “S”, this signifies that the dayboard is square.
T
In US waters, returning from seaward and proceeding toward the head of navigation is generally considered as moving southerly along the Pacific coast.
F
Mooring buoys are white with a blue horizontal band.
T
A flashing light is a light in which the total duration of darkness is shorter than the total duration of light and the appearances of darkness are usually of equal duration.
F
Geographic range for a light is given in the light list.
F
A circular shaped dayboard indicates danger.
F
A military excersise area would be marked by a special mark.
T
Oil Well structures are not listed in the light list.
T
A morse code lght has light flashes that are of clearly different durations.
T
The chart symbol Oc(2) refers to a group occulting light. The number 2 refers to the number of eclipses in the period.
T
A preferred channel marker could be a can with no light.
T
When transiting the main channel you see a green buoy with a yellow triangle. If in the ICW, this marker should be left to starboard.
T
Bearings in the light list are in degrees true.
T
Isolated Danger Marks have navigable water all around them.
T
A special mark coud be used to mark an anchorage.
T
Non-Lateral marks are used to supplement lateral aids to navigation.
T
A red or green lateral mark shall be numbered or lettered.
F
Diamond shaped day-boards that have no lateral significance are divided into four diamond shaped sectors with the top sectors being white.
F
A special mark could be lettered.
T
Obstructions part of the appurtenances to the main structure of an oil well structure are usually lighted.
F
The range of a light is not listed in the light list for private aids to navigation.
T
LNB’s are red in color.
T
An LNB is considered a floating lighthouse.
T
Numbers for red and green buoyage systems increase when proceeding from port and going to sea.
F
Red aids to navigation have odd numbers.
F
The purpose of aids to navigation exhibiting white or yellow lights may be determined by shapes, colors, letters and light rhythms.
T
The center stripe of a range marker could be yellow.
F
A Special Purpose mark would be used to mark a spoil area.
T
In the standard designation system for dayboards, the first lettter refers to the key color.
F
In the standard designation system for dayboards, the third letter is only used on dayboards that are marking a range.
T
Height above the water as listed in the light list is the height above the water from the focal plane of the fixed light to MLW.
F
Isolated Danger marks always have a topmark consisting of two red balls.
F
For situations where lights require a distinct cautionary significance, as at sharp turns, sudden channel constrictions , wrecks or obstructions, a quick flashing light rhythm is used.
T
A dayboard that has the letter “M” marks a fairway or the middle of the channel.
T
If the second letter on a dayboard is “Y”, it indicates that the key color of the dayboard is yellow.
T
Special Marks are intended to assist navigation.
F
The range of a light is not listed in the light list for private aids to navigation, range lights and directional lights.
T
Height above the water as listed in the light list is the height above the water from the focal plane of the fixed light to MHW.
T
Port side lateral marks have odd numbers.
T
Red aids to navigation have even numbers.
T
Bearings on rangelines are given in degrees and tenths of minutes.
T
A mark with a yellow diamond with yellow retroreflective panels and exhibiting a yellow light with Morse Code (B). This is marking the centerline of a draw bridge.
T
A beacon that is used as a safe water mark would have an octagonal daymark.
T
A Safe Water Mark may have a white light with a rhythm of Morse Code “A.”
T
A dayboard with the letter “N” signifies that the marker has no lateral significance.
T
If the second letter on a dayboard is “R”, it indicates that the key color of the dayboard is red.
T
A single occulting light has a light flash that is regularly repeated.
F
A preferred chanel mark always has a colored red or green light when lighted.
T
Letters are used to augment numbers in buoyage systems.
T
The shape of a special purpose mark is optional.
T
A regulatory mark may not have a light rhythm of quick flashing.
T
A dayboard with the letter “J” could be square.
T
Preferred channel marks may normally be passed on either side.
T
A single occulting light is an occulting light in which the eclipse is regularly repeated.
T
At a point where a channel divides when proceeding the conventional direction of buoyage a preferred channel in IALA Region B may be indicated by a modified port or starboard lateral mark.
T
In the standard designation system for dayboards, the first lettter refers to the shape or purpose of the board.
T
Lightouses most often do not have lateral significance.
T
A buoy with a green light can only mark the port side of a channel.
F
Safe Water Marks have safe water on all sides.
T
Lateral Marks are buoys or beacons indicating the port and starboard sides of a route to be followed.
T
A local authority may establish ATN to mark marine parades and regattas.
F
The centerline of the navigable channel through the draw span of floating bridges may be marked with a special mark.
T
A safe water mark could be lettered.
T
When transiting the main channel you see a red buoy with a yellow triangle. If in the ICW, this marker should be left to starboard.
T
A Safe Water Mark may have a white light with a quick flashing rhythm.
F
A special purpose mark can have a light rhythm of fixed or quick flashing.
F
Colors are the only feature of the buoyage system which has lateral significance.
T
A safe water mark may be numbered or lettered.
F
A Spherical Buoy may have lateral significance.
F
A yellow triangle indicates that the marker should be left to starboard when in the ICW.
T
A sidemark may be used outside the limits of a channel.
T
An Isolated Danger Mark can have a group (2) flashing white light.
T
White and yellow lights have no lateral significance.
T
Lateral aids to navigation indicate which side of an aid to navigation a vessel should pass when channels are entered from seaward and proceeds in the conventional direction of buoyage.
T
A dayboard that is marked on the chart “NW” with an orange reflective border and black letters.
T
A flashing light shows more light in a period than an occulting light would.
F
Shapes are laterally significant only when associated with laterally significant colors.
T
A buoy that is used as a regulatory mark is white with two horzontal red bands around the top and bottom.
F
Information and Regulatory marks are used to alert the mariner to various warnings or regulatory matters.
T
Shapes are laterally significant only when associated with red or green buoys.
T
A dayboard with the letter “J” would not be used to mark a wreck.
F
A special mark could be used to exhibit a military exercise area.
T
A regulatory mark has a white light when lighted.
T
A lighthouse with a white light will have no lateral significance.
T
The abbreviation “lt” in the light list stands for “lighted.”
T
A lateral mark can have an occulting light.
T
A preferred channel marker can be lettered.
T
When letters are used in a buoyage system to augment numbers, they increase sequentially from sea.
T
The range of lights as listed in the Light List is the luminous range.
F
The shape of a special purpose mark is optional but is selected to be appropriate for the position of the mark in relation to the navigable waterway and the direction of buoyage.
T
A yellow square on a buoy has lateral significance.
T
Light Rhythms indicate the lateral significance.
F
In US waters, returning from seaward and proceeding toward the head of navigation is generally considered as moving southerly along the Atlantic coast.
T
An isolated Danger Mark could be a nun buoy.
F
Information and Regulatory marks have orange geometric shapes against a black background.
F
On either side of the line of demarcation between white, red and green sectors, there is a small arc of uncertain color.
T
Safe Water Marks are always lighted.
F
Marks in the ICW may exhibit reversed lateral significance.
T
The range of a light is listed in the light list for directional lights.
F
The IALA Buoyage system uses five different types of marks.
T
The purpose of a Special Purpose Mark has to be determined by using a chart, Coast Pilot, Light List or NTM.
T
Safe Water Marks, when lighted, are always lighted with a Morse Code “A” rhythm.
T
You sight mark with a yellow diamond with yellow retroreflective panels and exhibiting a yellow light with Morse Code (B). This is marking the centerline of a fixed bridge.
F
The abbreviation “lt” in the light list stands for “light.”
F
A dayboard with the letter “J” may be marking a wreck or obstruction.
T
A single occulting light has an eclipse that is regularly repeated.
T
The range of lights as listed in the Light List is the geographic range.
F
A dayboard with the letter “J” has lateral significance.
T
Latitude and Longitude in the light list is the exact position of the aid.
F
Mooring buoys are white with two blue horizontal bands.
F
A Special Purpose mark would be used to mark a dredge pipeline.
T
A dayboard that is marked on the chart with the first letter being “N” may be diamond or rectangular shaped.
T
A dayboard that is marked on the chart “NY” is a diamond shaped dayboard, with four diamond sectors that are white and yellow.
F
Green lights mark a preferred channel to starboard.
T
A dayboard with the letter “N” may be used to mark a distance marker.
T
In the standard designation system for dayboards, the third letter is only used on dayboards that have lateral significance.
F
Safe Water Marks are red and white striped and have a red spherical day mark.
T
Oil well structure will sometimes sound sirens, whistles or horns will sound a single two second blast every 20 seconds.
T
The third letter of a dayboard is the color of the center stripe on a range board.
T
A dayboard with the letter “N” may be used as a warning marker.
T
Height above the water as listed in the light list is the height above the water from the focal plane of the fixed light to MHHW.
F
If there are two more channels through a bridge the preferred channel is marked by three white lights in a vertical line.
T
Green lights may mark the centerline of the channel through a bridge.
T
The dayboard designation “-SY” can never be on a lateral mark that is triangular.
F
The a local authority may establish ATN to mark marine parades and regattas with the permission of the USCG.
F
A red or green lateral mark shall be numbered.
T
A red LNB would have lateral significance.
F
Drawbridges equipped with radiotelephones display a blue and white sign which indicates what VHF channels are used.
T
In a buoyage system, numbers are kept in approximate sequence on both sides of the channel by omitting numbers where necessary.
T
A yellow horizontal band provides lateral information when transiting the ICW.
F
An isolated Danger Mark could be a can buoy.
F
Green lights are shown on bridges to show the left side of the channel through the bridge, or to mark the centerline of the bridge.
T
Lateral aids to navigation indicate which side of an aid to navigation a vessel should pass when channels are entered from port and proceeds in the conventional direction of buoyage.
F
In the absence of a route leading from seaward, the conventioal directional of buoyage generally follows a counter-clockwise direction around land masses.
F
Letters are used to augment numbers in buoyage systems only where aids are added to a previously completed sequence.
T
Information and regulatory marks, when lighted, display a white light with any rhythm except Mo A, quick flashing and flashing (2).
T
Actual watch circles coincide with the symbol represented them on charts.
F
Oil Well structures are listed in the light list.
F
Beacons are permanently fixed to the earths surface.
T
A lighted Isolated Danger Mark would have a daymark.
T
A special mark may be numbered.
F
A daymark is intended to convey to the mariner during the day the same signficance as the aids light at night.
T
A regulatory mark may be lettered.
T
In the standard designation system for dayboards, the fourth letter conveys additional information.
T
If an Isolated Danger Mark is unlighted, it will not have the double sphere topmark.
F
A lateral mark can mark an obstruction.
T
A green buoy can have letters in addition to numbers.
T
A composite group flashing light has a light with groups of flashes regularly repeated and the successive groups in the period have a different number of flashes.
T
Preferred Channel Marks can mark a wreck or an obstruction.
T
Light sectors are given in bearings that are degrees true from the observer to the light.
T
Oil well structure will sometimes sound sirens, whistles or horns will sound a single two second blast every 10 seconds.
F
Main channels through bridges may be marked by lateral red and green lights or dayboards.
T
A light that is quick flashing flashes at 60 times per minute.
T
Information concerning the location and characteristics of oil well structures which display lights and sound signals located in obstruction areas are listed in the Light List.
F
A special mark may be lighted with a yellow light.
T
A special purpose mark can have a light rhythm of fixed yellow.
T
A red and green stripped mark with the topmost band green indicates that the preferred channel is to port.
F
Aids marking the ICW display unique yellow symbols to distinguish them from aids marking other waters
T
Unless fitted with a topmark, lighted, sound, pillar and spar buoys have no shape significance.
T
Latitude and Longitude in the light list is an approximate position of the aid.
T
A dayboard is marked “KGB-I”. This dayboard marks a range, and is green with a black center stripe.
T
If there are two more channels through a bridge the preferred channel is marked by a green light with three white lights in a line above it.
T
Isolated Danger marks always have the double ball topmark and are numbered.
F
A dayboard with the letter “C” is used on western rivers only.
T
An Isolated Danger Mark could not be a can buoy.
T
Oil well structure will sometimes sound bell signals of one stroke every 10 seconds.
F
In the Light List, the abbreviation “Al” means alternating.
T
Nominal range for a light is given in the light list.
T
A Special Mark does not have lateral significance, and is not intended to assist in navigation.
T
A yellow horizontal band provides no lateral information when transiting the ICW.
T
A dayboard marked “JG-I” is a square dayboard, red and green striped with the top stripe green. It also has a yellow reflective border.
F
Isolated Danger Marks can be lighted with a red or green light.
F
A safe water mark shall be lettered.
F
A dayboard with the letter “J” may mark a wreck.
T
Isolated Danger Marks can be lighted with a white light.
T
In the standard designation system for dayboards, the second lettter refers to the key color.
T
A special mark could have a fixed or flashing white light.
F
A buoy with a green light can mark the port side of a channel or a preferred channel.
T
Aids marking the ICW display unique white symbols to distinguish them from aids marking other waters.
F
When transiting the main channel you see a green buoy with a yellow triangle. If in the ICW, this marker should be left to port.
F
A series of white lights extending up an oil well derrick indicate that well is conducting drilling operations.
T
Safe Water Marks are always lighted.
F
A regulatory mark may be numbered.
F
A dayboard that is marked on the chart “NW” with an orange reflective border and yellow letters.
F
Safe Water Marks mark fairways, mid-channels and offshore approach points.
T
In the Light List, the abbreviation “fl” means flashing.
F
All beacons exhibit a day mark.
T
A special mark may have a fixed or flashing yellow light.
T
Safe Water Marks are red and white striped.
T
For situations where lights require a distinct cautionary significance, as at sharp turns, sudden channel constrictions , wrecks or obstructions, a flashing light rhythm is used.
F
A light with a quick flashing light would have a distinct cautionary significance.
T
Isolated Danger marks always have a topmark.
T
Identification of an aid to navigation may be more difficult at twilight.
T
If the second letter on a dayboard is “B”, it indicates that the key color of the dayboard is black.
T
A dayboard with the letter “J” would be square.
F
When approaching a sectored light, you can alternate course and observe the changing sectors to get an accurate bearing of the light.
F
Letters are added to numbers as prefixes.
F
A white light may have a reddish hue in some atmospheric conditions.
T
The purpose of a Special Purpose Mark is indicated by it’s shape or light.
F
Bearings on rangelines are given in degrees and tenths of degrees.
F
When not conducting drilling operations, oil well structures are usually marked with one or more fixed or quick flashing white or red lights, visible for one nautical mile.
T
A dayboard with the letter “N” signifies that the marker has lateral significance.
F
A lighted Isolated Danger Mark could have a daymark.
F
The range of a light is listed in the light list for range lights.
F
A special mark may have a letter.
T
A light that is quick flashing flashes at 50 to 70 times per minute.
F
The purpose of aids to navigation exhibiting white or yellow lights may be determined by the shapes, colors, letters and light rhythms.
T
A preferred channel marker has white light with a rhythm of FL (2+1).
F
An occulting light shows more light in a period than a flashing light would.
T
The USCG administers the ATN system.
T
Isolated Danger marks always have the double ball topmark.
T
A beacon that is used as a safe water mark would have a spherical daymark.
F
The light list includes all USCG aids to navigation used for general navigation.
T
Special Marks are not intended to assist navigation, but to alert the mariner to a special feature in the area.
T
Flashing lights have frequencies that do not exceed 30 flashes per minute.
T
An unlighted Isolated Danger Mark does not have to have a daymark.
F
A Morse Code light has appearances of light that are of equal duration.
F
A regulatory mark may have a light rhythm of flashing (2).
F
The height of lights is listed in the light list in meters and feet.
F
A dayboard with the letter “K” signifies that the marker has lateral significance.
F
A solid red or green marker must have a shape that indicates the side which it should be passed.
F
The chart symbol Oc(2) refers to a group occulting light. The number 2 refers to the number of light flashes in the period.
F
A regulatory mark may have not a light rhythm of flashing (2).
T
A circular shaped dayboard indicates that certain operating restrictions are in effect within the marked area.
T
The numbers for a buoyage system increase from seaward, preceedng in the conventional direction of buoyage.
T
A dayboard that is marked on the chart “NW” is an information or regulatory mark.
T
A preferred channel marker has red or green light with a rhythm of FL (2+1).
T
Ranges are non-lateral aids to navigation.
T
A lateral mark would have a flashing light.
F
Daybeacons or minor lights outside the channel will not have lateral significance.
T
Latitude and Longitude in the light list is given to the nearest second.
T
All solid green or red aids to navigation are numbered.
T
If the fourth letter on a dayboard is an “I” it signifies that the marker is part of the ICW.
T
Diamond shaped day-boards that have no lateral significance are divided into four diamond shaped sectors with the side sectors being white.
T
A Safe Water Mark may have a white light with a rhythm of Morse Code dit dit da.
F
A safe water mark would be lettered.
F
Buoy Positions represented on nautical charts are exact positions.
F
In the absence of a route leading from seaward, the conventioal directional of buoyage generally follows a clockwise direction around land masses.
T
Cardinal Marks are not used in the United States.
T
Isolated Danger marks always have a topmark consisting of two black balls.
T
A special mark may be lighted with a white light.
F
A diamond shaped dayboard could be numbered.
F
The USCG may establish ATN to mark marine parades and regattas.
T
No special signaficance should be attaxced to the color or rhythm of a range light.
T
A red lateral mark can have a light rhythm of flashing (2).
T
A yellow square indicates that the marker should be left to starboard when in the ICW.
F
A range dayboard may have a number.
F
Isolated Danger Marks should be approached with caution.
T
A solid green buoy can have a light rhythm of flashing or group flashing.
T
Only lighted aids to navigation with red or green lights have lateral significance.
T
An open faced diamond shape signifies that vessels are excluded from the area.
F
A green buoy can be lettered only.
F
Daybeacons that have no lateral significance utilize diamond shaped day-boards.
T
A Special Purpose Mark is always lighted.
F
A dayboard with the letter “K” signifies that it marks a range.
T
In US waters, returning from seaward and proceeding toward the head of navigation is generally considered as moving westerly along the Gulf coast.
T
A lighted Isolated Danger Mark does not have to have a daymark.
F
Information and regulatory marks, when lighted, display a white light with any rhythm except Mo A.
F
A red and green stripped mark with the topmost band green indicates that the preferred channel is to starboard.
T
Green lights can mark wrecks or obstructions.
T
Range markers are always lighted.
F
A dayboard that is marked on the chart “NW” with an orange reflective border and orange letters.
F
A red lateral mark can have an isophase light.
T
A regulatory mark could have a light rhythm of flashing (2).
F
Oil well structure will sometimes sound bell signals of one stroke every 15 seconds.
T
A special purpose mark can have a light rhythm of fixed white.
F
Ranges display rectangular daymarks.
T
If the second letter on a dayboard is “Y”, it indicates that the center stripe of the rangeboard is yellow.
F
LNB’s are green in color.
F
A flashing light is a light in which the total duration of light is shorter than the total duration of darkness and the appearances of light are usually of equal duration.
T
A diamond shape having a cross centered within indicates danger.
F
In a buoyage system, numbers are kept in approximate sequence on both sides of the channel.
T
A regulatory mark may have a light rhythm of quick flashing.
F
In the Light List, the abbreviation “Fl” means flashing.
T
An occulting light is a light in which the total duration of light in a period is longer than the duration of darkness and the intervals of darkness are usually of unequal duration.
F
Only black, green and red are used on diamond shaped dayboards to mark the diamond shaped sectors.
T
The primary color of a range dayboard could be yellow.
F
An Isolated Danger Mark can have a quick flashing white light.
F
If the first letter on a dayboard is “J”, this signifies that the dayboard is marking a junction or bifurcation.
T
A dayboard that is marked on the chart with the first letter being “N” may be a diamond shape or circular.
F
While transiting the ICW, you sight a red buoy with a yellow square. This buoy should be left to port.
T
An occulting light is a light in which the total duration of darkness in a period is longer than the duration of light.
F
A safe water mark may be numbered.
F
A preferred channel marker has white, red or green light with a rhythm of FL (2+1).
F
A flashing rhythm is preferred on a yellow special mark .
T
The abbreviation “FS” in the light list stands for “fog signal.”
T
If the second letter on a dayboard is “W”, it indicates that the key color of the dayboard is white.
T
A dayboard with the letter “J” will be red and green striped.
T
Shapes are the only feature of the buoyage system which has lateral significance.
F
A regulatory mark has a yellow light when lighted.
F
A dayboard is marked “KGB-I”. This dayboard marks a range, and is black with a green center stripe.
F
The purpose of aids to navigation exhibiting white or yellow lights may be determined by letters.
T
A preferred channel marker can be numbered or lettered.
F
Solid green buoys are always lighted.
F
Light Rhythms do not indicate the lateral significance.
T
It is always possible to pass on either side of a preferred channel mark.
F
