單項選擇題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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1.單項選擇題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

2.單項選擇題The difference between magnetic heading and compass heading is called（）.

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

3.單項選擇題The compass heading of a vessel differs from the true heading by（）.

A.compass error
B.variation
C.magnetic dip
D.deviation

4.單項選擇題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

5.單項選擇題The compass deviation changes as the vessel changes（）.

A.geographical position
B.speed
C.heading
D.longitude