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31 Cards in this Set
- Front
- Back
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Occulting light and period
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Total duration of light in a period is longer than the total duration of darkness. Period is 12 seconds.
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Group occulting and period
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An occulting light for which a group of eclipses, specified in number, is repeated. Period is 14 seconds.
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Composite group occulting and period
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Similar to group occulting light except successive groups in a period have different numbers of eclipses. Period is 9 seconds.
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Isophase and period
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Equal light and dark periods. Period: 5 seconds.
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Purpose of sector lights
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Used to warn navigator of hazards to navigation when approaching from certain dangerous arcs or sectors
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Sector limits are expressed in degrees _______ as observed from the _______.
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true, vessel
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Sector light colors.
Red Green White |
Red: danger areas
Green: turning points or best water areas White: marks good water |
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Sounds for buoys
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Bells, gongs, whistles, horns, sirens.
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Five types of buoys
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Can
Cone (nun) Pillar Spar Sphere |
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What does IALA stand for?
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Buoys common to both IALA A and IALA B
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Isolated danger marks
Safe water marks Special marks |
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Light characteristics and color for isolated danger marks
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Color: Black with red band(s).
Lights: White flashing Group of 2 flashes (remember: 2 black ball, 2 flashes). |
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Uses and color for safe water buoys
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Color/use of special purpose buoys
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Yellow.
Used in traffic separation. |
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Four types of regulatory marks and shapes for each
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Danger Diamond
Restricted areas Circle Exclusion zones Diamond with plus sign Directions or instructions Square or rectangle |
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What does ARPA stand for?
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Three uses of ARPA
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Collision Avoidance
Surface Contact Management Navigation |
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What is an EBL?
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Electronic Bearing Line. Allows a bearing between two objects on the radar display to be determined.
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What is a VRM?
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Variable Range Marker. A single ring with an operator-defined radius used to measure distance between two points.
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Definition of range scale
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Defines distance from center of the display area to the bearing scale on the outer edge of the screen
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Three modes of operation for ARPA
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Heads up
North up Course up |
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Three types of magnetism
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Terrestrial
Permanent Induced |
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What does DFGMC stand for and what does it do?
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Definition of variation
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the angular difference between true north and magnetic north at a particular place.
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Definition of deviation
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the deflection of a vessel’s compass needle caused by iron in the vessel, which varies with the vessel’s heading.
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GET formula
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Gyrocompass + East heading = True heading
Al |
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Acronym for gyrocompass error
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Can Compass Bearing (° pstgc)
Dead Deviation Men Magnetic Meridian Vote Variation Twice True Bearing (°T) @ Add Elections East Error |
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What does DIVTACS stand for? Who directs them?
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Fleet maneuvers, or division tactics (DIVTACS).
Movements directed by an Officer in Tactical Control. |
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Standard distance between small and large ships
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Small ships: 500 yds
Large ships: 1,000 yds |
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Definition for turn together
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Definition for Wheel (Corpen) maneuver
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A maneuver to alter course in such a manner that all ships will be in their former relative positions on completion of the maneuver.
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