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單項選擇題

The lubber’s line of a magnetic compass（）.

A.always shows true north direction
B.indicates the vessel's heading
C.is always parallel to the vessel's transom
D.is located on the compass card

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單項選擇題

The horizontal angle between the magnetic meridian and the north-south line of the magnetic compass is（）.

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

單項選擇題

The gyrocompass error resulting from your vessel’s movement in OTHER than an east-west direction is called（）.

A.damping error
B.ballistic deflection
C.quadrantal error
D.speed error

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