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
When a vessel changes course from one cardinal heading to another cardinal heading whilea djusting the compass，which action should be taken?（）
By convention，the north seeking ends of a compass’ magnets are colored（）.
Which statement about the gyrocompass is FALSE（）.
Variation is the angular measurement between（）.
Which compensates for errors introduced when the vessel heels over（）.
What is the basic principle of the magnetic compass（）.
Variation in a compass is caused by（）.
The quadrantal spheres are used to（）.
The Flinders bar on a magnetic compass compensates for the（）.
What are the only magnetic compass correctors that correct for both permanent and induced effects of magnetism?（）