單項選擇題

Variation is a compass error that you（）.

A.can correct by adjusting the compass card
B.can correct by adjusting the compensating magnets
C.can correct by changing the vessel's heading
D.cannot correct

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單項選擇題

Variation in a compass is caused by（）.

A.worn gears in the compass housing
B.magnetism from the earth's magnetic field
C.magnetism within the vessel
D.lack of oil in the compass bearings

單項選擇題

True heading differs from magnetic heading by（）.

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