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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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
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