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
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A.permanent magnetism
B.subpermanent magnetism
C.induced magnetism
D.variable magnetism
A.An agonic line
B.The magnetic equator
C.A magnetic meridian
D.All of the above
A.They are not subject to permanent magnetism; no check is necessary
B.Semiannually
C.Annually
D.Every five years
A.Induced magnetism in vertical soft iron
B.Induced magnetism in horizontal soft iron
C.Permanent magnetism in ship's steel
D.Vessel's inclination from the vertical
最新試題
When relieving the helm，the new helmsman should know the（）.
When adjusting a magnetic compass using the fore-and-aft permanent magnets，you should（）.
When crossing the magnetic equator the（）.
The Flinders bar and the quadrantal spheres should be tested for permanent magnetism at what interval（）.
Which magnetic compass corrector（s）can be set while the vessel is on a heading of magnetic north or magnetic south（）.
What is used to correct for both induced and permanent magnetism，and consequently must be readjusted with radical changes in latitude（）.
The line which connects the points of zero magnetic dip is（）.
The magnetism in the various structures of a ship changing as a result of cruising，vibration，or aging is termed（）.
Which statement about the gyrocompass is FALSE（）.
When changing from a compass course to a true course you should apply（）.