单项选择题

The magnetic compass operates on the principle that（）.

A.like magnetic poles attract
B.unlike magnetic poles repel
C.unlike poles attract
D.the poles of the compass line up with the geographic poles of the earth

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单项选择题The magnetic compass magnets are acted on by the horizontal component of the Earth’s total magnetic force. This magnetic force is GREATEST at the（）.

A.north magnetic pole
B.south magnetic pole
C.magnetic prime vertical meridian
D.magnetic equator

单项选择题The lubber’s line on a magnetic compass indicates（）.

A.compass north
B.the direction of the vessel's head
C.magnetic north
D.a relative bearing taken with an azimuth circle

单项选择题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

单项选择题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

单项选择题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