单项选择题
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
Quadrantal error in a gyrocompass has its GREATEST effe...
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
