单项选择题

The error in a magnetic compass caused by the vessel’s magnetism is called（）.

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

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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
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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