A.Remove deviation on the intercardinal headings
B.Remove deviation on the cardinal compass headings
C.Remove heeling error
D.Compensate for induced magnetism in vertical soft iron
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A.nonmagnetic
B.weatherproof
C.corrosion resistant
D.capable of being permanently affixed to the vessel
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
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
最新試題
Which statement about the gyrocompass is FALSE（）.
This induced magnetism（）the permanent magnetism already present in the ship.
The line which connects the points of zero magnetic dip is（）.
When adjusting a magnetic compass using the fore-and-aft permanent magnets，you should（）.
Variation is the angular measurement between（）.
The most accurate method of determining gyrocompass error while underway is by（）.
What are the only magnetic compass correctors that correct for both permanent and induced effects of magnetism?（）
When relieving the helm，the new helmsman should know the（）.
Which magnetic compass corrector（s）can be set while the vessel is on a heading of magnetic north or magnetic south（）.
The Flinders bar and the quadrantal spheres should be tested for permanent magnetism at what interval（）.