Which magnetic compass corrector（s）can be set while the vessel is on a heading of magnetic north or magnetic south（）.<br>A:Quadrantal spheres<br>B:Heeling magnets<br>C:Flinders bar<br>D:Fore-and-aft magnets

Which magnetic compass corrector（s）can be set while the vessel is on a heading of magnetic north or magnetic south（）.
A:Quadrantal spheres
B:Heeling magnets
C:Flinders bar
D:Fore-and-aft magnets

出自：海船船员证

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