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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

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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

單項選擇題

The compass deviation changes as the vessel changes（）.

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