单项选择题
A.Heeling magnet B.Flinders bar C.Fore-and-aft magnets D.All of the above can be set on magnetic east or magnetic west headings
Which magnetic compass corrector（s）can be set while the...
单项选择题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
Which compensates for errors introduced when the vessel...
单项选择题Which compensates for errors introduced when the vessel heels over（）.
A.The soft iron spheres on the arms of the binnacle B.Magnets placed in trays inside the binnacle C.A single vertical magnet beneath the compass D.The Flinders bar
When relieving the helm，the new helmsman should know th...
单项选择题When relieving the helm，the new helmsman should know the（）.
A.Course per magnetic steering compass B.Gyro error C.Variation D.Maximum rudder angle previously used
