单项选择题

The directive force of a gyrocompass（）.

A.increases with latitude，being maximum at the geographic poles
B.decreases with latitude，being maximum at the geographic equator
C.is greatest when a vessel is near the Earth's magnetic equator
D.remains the same at all latitudes

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

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

单项选择题

The compass heading of a vessel differs from the true heading by（）.

A.compass error
B.variation
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The compass error of a magnetic compass that has no deviation is（）.

A.zero
B.equal to variation
C.eliminated by adjusting the compass
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