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45 Cards in this Set
- Front
- Back
What is he element of a particular lighted aid to navigation which causes it to be most readily distinguishable from a distance?
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Its characteristic light cycle
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What is symbolized by the abbreviation A1t.F.Gp.F1.?
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Alternating fixed and group flashing.
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What is symbolized by the abbreviation A1t.Gp.0cc?
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Alternating group occulting
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What is ment by a fixed navigational light?
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It means that the light burns in a continuous steady mannerand does not change color.
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What is the characterstics of an occulting light?
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The duration of he dark interval is less then that of the light interval.
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What are the characteristics of a quick flashing light?
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It flashes at a rate of not less the 50 flashes pre min but less then 80 flashes per minute.
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What is the designation of a light which shows a continuous steady light upon which is superimposed a flash of light which is of greater brightness at a regular 3-second interval?
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It is called a fixed and flashing light.
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Why is seacoast light fixed in a lighthouse or in a light structure?
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In order to increase the visibility range.
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What type of navigational equipment maybe placed inside a lighthouse besides the light itself?
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Radio beacon equipment and/or fog signaling equipment.
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How are danger bearings exhibited when viewing a lighthouse?
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When the light from the lighthouse burns red throughout an arc of bearing, then danger sectors are being indicated.
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How does a lighthouse differ form a light station?
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A lighthouse may contain a living quarter for the resident personnal. At a light station the operators are housed in separate buildings.
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How can a lighthouse be absolutely identified during the day?
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By its color pattern.
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What other function may a light structure fulfill, besides the function of bearing a light?
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It can act as a channel marker.
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What is a lightship?
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A floating lighthouse which is positioned where conditions make it impossible to build a permanent structure
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What international code signal is hoisted by a lightship which is underway or off its station?
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LO
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What characterizes a relief lightship?
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The word "RELIEF"painted in white on both sides
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What are the most abundant aids to navigation?
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Buoys
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What is a LANBY?
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A Large Automatic Buoy
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How large is a landby?
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It is 40 feet in diameter
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What is the IALA
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The international association of lighthouse authorities
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In what year was theIALA maritime Buoyage System agreement signed by moost of the worlds maritime nations?
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1982
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In buoy region A, are buoys red to port or red to starboard when entering seaward?
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Red to port.
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In what buoy region is North America?
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Region B
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What are the five basic buoy shapes?
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Can,nun,spherical,piller and spear
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What is a piller buoy?
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Any buoy smaller than a lighthouse buoy which has a tall, central structure on a broad base.
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What is a "spar"?
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iIt is a large log which has been trimmed, shaped, and appropriately painted as a navigational aid(can also be in metal)
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What is the difference between a nun buoy and a can buoy?
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A nun buoy is conical in shape and a can buoy is clyindrical in shape.
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What is the energy source for most sound-signaling buoys?
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The movement of the sea
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How does a gong buoy differ from a bell buoy?
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it supports 4 gongs, with each gong sounding a different note.
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What is ment by the term "combination buoy"?
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That means that the buoy combines both sound and light signal's
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What is the meaning of a solid black buoy when a ship is approaching a harbor from seaward?
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It indicates the left side of the cgannel (in region B)
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What color scheme is used on buoys which are used to mark obstructions and channel junctions?
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Black and Red Horizontal banding.
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Which color of buoy has no navigational significance?
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An all white Buoy
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What do black and white vertically striped buoys indicate?
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They designate the middle of a channel or fairway.
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How are quarantine anchorages indicated?
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By yellow buoys
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What is the usually signified by a white buoy with a green top?
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A dredging area
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How are black channel buoys numbered, when approaching from seaward?
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They are numbered with odd numbers, starting with with the first buoy from seaward.
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On which color of buoys can green lights be used?
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They can be used on black or black and red horizontally banded buoys with the uppermost band black
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What buoy is allowed to bear a white light?
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They are allowed on any color of buoy
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What is the characteristic exhibited by a midchannel buoy light?
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The morse code A signal
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When may buoys be used for taking a navigational fix?
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Never, because their position is not sufficiently dependable.
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What is ment by a "daybeacon range"?
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It consists of 2 daybeacons which are located on the same specific true bearing at some distance from one another so that when a ship sees them precisely in line , the ship is then on the range of the true bearing
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What shapes are the daymarks which are equivalent to spherical buoys?
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Octagonal
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What is the distinguishing color which appers on all buoys, daybeacons and light structures along the intercoastal waterway?
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Yellow
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What part of a channel is indicated by a daybeacon showing an octagon having black and white stripes?
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Midchannel
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