单项选择题

The standard magnetic compass heading differs from the true heading by（）.

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

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单项选择题

The reaction of a gyrocompass to an applied force is known as（）.

A.precession
B.earth rate
C.gyroscopic inertia
D.gravity effect

单项选择题

The quadrantal spheres are used to（）.

A.remove deviation on the intercardinal headings
B.remove deviation on the cardinal compass headings
C.remove heeling error
D.compensate for induced magnetism in vertical soft iron