单项选择题

The compass heading of a vessel differs from the true heading by（）.

A.compass error
B.variation
C.magnetic dip
D.deviation

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单项选择题

A.zero
B.equal to variation
C.eliminated by adjusting the compass
D.constant at any geographical location

单项选择题

A.geographical position
B.speed
C.heading
D.longitude

单项选择题

A.in high latitudes
B.near the equator
C.on north or south headings
D.on intercardinal headings