单项选择题
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
When crossing the magnetic equator the（）.A.Flinders bar...
单项选择题When crossing the magnetic equator the（）.
A.Flinders bar should be inverted B.Heeling magnet should be inverted C.The quadrantal spheres should be rotated 180° D.Flinders bar should be moved to the opposite side of the binnacle
What is used to correct for both induced and permanent ...
单项选择题What is used to correct for both induced and permanent magnetism，and consequently must be readjusted with radical changes in latitude（）.
A.Flinders bar B.Soft iron spheres C.Fore-and-aft permanent magnets in their trays D.Heeling magnet
