Which statement about the Flinders bar of the magnetic compass is CORRECT（）.<br>A:It compensates for the error caused by the vertical component of the Earth's magnetic field<br>B:It compensates for error caused by the heeling of a vessel<br>C:It compensates for quadrantal deviation<br>D:It is only needed in equatorial waters

Which statement about the Flinders bar of the magnetic compass is CORRECT（）.
A:It compensates for the error caused by the vertical component of the Earth's magnetic field
B:It compensates for error caused by the heeling of a vessel
C:It compensates for quadrantal deviation
D:It is only needed in equatorial waters

出自：海船船员证

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