单项选择题

The difference between magnetic heading and compass heading is called（）.

A.variation
B.deviation
C.compass error
D.drift

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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
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
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