When relieving the helm，the new helmsman should know the ______．A.Course per magnetic steering compassB.Gyro errorC.VariationD.Maximum rudder angle previously used
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
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单选题When crossing the magnetic equator the（）.AFlinders bar should be invertedBHeeling magnet should be invertedCThe quadrantal spheres should be rotated 180°DFlinders bar should be moved to the opposite side of the binnacle
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单选题When a magnetic compass is not in use for a prolonged period of time it should（）.Abe shielded from direct sunlightBbe locked into a constant headingChave any air bubbles replaced with nitrogenDhave the compensating magnets removed
单选题When relieving the helm，the new helmsman should know the（）.ACourse per magnetic steering compassBGyro errorCVariationDMaximum rudder angle previously used
单选题When adjusting a magnetic compass for error，a deviation table should be made（）.Abefore correcting for any deviationBafter correcting for variationCafter adjusting the fore-and-aft and athwartships permanent magnetsDbefore the quadrantal correctors are placed on the compass