A.with part of it extending above the water
B.that can be detected by water turbulence
C.that drops off sharply
D.perpendicular to the current
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A.Great Circle
B.Position Line
C.Rhumb line
D.True Bearing
A.dead reckoning
B.dead weight
C.dead slow ahead
D.dead slow astern
A.difference between the true course and the compass course
B.momentum of a vessel after her engines have been stopped
C.lateral movement of a vessel downwind of her intended course
D.displacement of a vessel multiplied by her speed
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The time required for a lighted aid to complete a full cycle of light changes is listed in the Light List as the（）.
When entering a channel from seaward，the numbers on buoys（）.
On a chart，the characteristic of the light on a lighthouse is shown as flashing white with a red sector.The red sector（）.
A celestial body will cross the prime vertical circle when the latitude is numerically （）.
The four standard light colors used for lighted aids to navigation are red，green，white，and （）.
When navigating a vessel，you（）.
What area of the earth cannot be shown on a standard Mercator chart（）.
When using horizontal sextant angles of three objects to fix your position，an indeterminate position will result in which situation（）.
Which of the following are data layer categories to be displayed on ECDIS（）．
What is an ebb current（）.