When relieving the helm，the new

: Which magnetic compass corrector（s）can be set while the vessel is on a heading of magnetic north or magnetic south ________．

: Which compensates for errors introduced when the vessel heels over ________．

: When a vessel changes course from one cardinal heading to another cardinal heading while adjusting the compass，which action should be taken ________．

A.The course change should be made rapidly to prevent transient induced magnetism while passing the intercardinal headings
B.After the new heading is reached，the vessel should steam on that course for at least two minutes before the adjustment
C.During the course change，you should gently tap the compass to remove any error caused by friction on the pivot bearing
D.After steadying on the new heading，the compass card should be slewed by a magnet and allowed to oscillate freely to remove any gaussin error

: This induced magnetism ______ the permanent magnetism already present in the ship．

: What is used to correct for both induced and permanent magnetism，and consequently must be readjusted with radical changes in latitude ________．

: The most accurate method of determining gyrocompass error while underway is by ______．

A.Comparing the gyro azimuth of a celestial body with the computed azimuth of the body
B.Comparing the gyro heading with the magnetic compass heading
C.Determining from the chart the course made good between celestial fixes
D.It cannot be determined accurately at sea due to drift of unknown currents

: The gyrocompass error resulting from your vessel's movement in OTHER than an east-west direction is called ______．

: The magnetism in the various structures of a ship changing as a result of cruising，vibration，or aging is termed ______．

When relieving the helm，the new helmsman should know the ______．