单选题The principal purpose of magnetic compass adjustment is to（）.Areduce the variation as much as possibleBreduce the deviation as much as possibleCreduce the magnetic dip as much as possibleDallow the compass bowl to swing freely on its gimbals
单选题
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
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Which one of the followings is incorrect about magnetic compass?______.A.The magentic compass is compulsory on my vesselB.The magentic compass is prone to errorC.The magentic compass is always placed inside steel constructionsD.The magentic compass needs to be calibrated to compensate for local magnetic distortion
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