单项选择题
A.variation B.deviation C.compass error D.drift
The compass heading of a vessel differs from the true h...
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
The compass error of a magnetic compass that has no dev...
单项选择题The compass error of a magnetic compass that has no deviation is（）.
A.zero B.equal to variation C.eliminated by adjusting the compass D.constant at any geographical location
The compass deviation changes as the vessel changes（）.A...
单项选择题The compass deviation changes as the vessel changes（）.
A.geographical position B.speed C.heading D.longitude
