单项选择题
The compass heading of a vessel differs from the true heading by（）.
A.compass error
B.variation
C.magnetic dip
D.deviation
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相关考题
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单项选择题
The compass error of a magnetic compass that has no deviation is（）.
A.zero
B.equal to variation
C.eliminated by adjusting the compass
D.constant at any geographical location -
单项选择题
The compass deviation changes as the vessel changes（）.
A.geographical position
B.speed
C.heading
D.longitude -
单项选择题
Quadrantal error in a gyrocompass has its GREATEST effect（）.
A.in high latitudes
B.near the equator
C.on north or south headings
D.on intercardinal headings
