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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A.precession
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单项选择题
The quadrantal spheres are used to（）.
A.remove deviation on the intercardinal headings
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单项选择题
The principal purpose of magnetic compass adjustment is to（）.
A.reduce the variation as much as possible
B.reduce the deviation as much as possible
C.reduce the magnetic dip as much as possible
D.allow the compass bowl to swing freely on its gimbals
