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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

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單項選擇題

The compass deviation changes as the vessel changes（）.

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

單項選擇題

Quadrantal error in a gyrocompass has its GREATEST effect（）.

A.in high latitudes
B.near the equator
C.on north or south headings
D.on intercardinal headings

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