单项选择题

Deviation which is maximum on intercardinal compass headings may be removed by the（）.

A.Flinders bar
B.transverse magnets
C.fore-and-aft magnets
D.soft iron spheres on the sides of the compass

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单项选择题

A.true meridian and the axis of the compass card
B.true meridian and the magnetic meridian
C.magnetic meridian and the axis of the compass card
D.axis of the compass card and the degaussing meridian

单项选择题

Deviation in a compass is caused by the（）.

A.vessel's geographic position
B.vessel's heading
C.earth's magnetic field
D.influence of the magnetic materials of the vessel

单项选择题

Compass error is equal to the（）.

A.deviation minus variation
B.variation plus compass course
C.combined variation and deviation
D.difference between true and magnetic heading