单项选择题

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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单项选择题

Magnets are placed in horizontal trays in the compass binnacle to compensate for the（）.

A.induced magnetism in the vessel's horizontal soft iron
B.change in the magnetic field when the vessel inclines from vertical
C.permanent magnetism of the vessel
D.magnetic fields caused by electrical currents in the vicinity

单项选择题

Magnetic variation changes with a change in（）.

A.the vessel's heading
B.sea conditions
C.seasons
D.the vessel's position

单项选择题

Magnetic heading differs from compass heading by（）.

A.compass error
B.true heading
C.variation
D.deviation