单选题Which statement about the Flinders bar of the magnetic compass is CORRECT（）.AIt compensates for the error caused by the vertical component of the Earth's magnetic fieldBIt compensates for error caused by the heeling of a vesselCIt compensates for quadrantal deviationDIt is only needed in equatorial waters
单选题
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
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