A.nonmagnetic
B.weatherproof
C.corrosion resistant
D.capable of being permanently affixed to the vessel
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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
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 adjusting a magnetic compass for error，a deviation table should be made（）.
What are the only magnetic compass correctors that correct for both permanent and induced effects of magnetism?（）
What is the name of the movable，radial guide line used to measure direction on a radar?（）
When crossing the magnetic equator the（）.
A ship under construction or major repair will acquire permanent magnetism due to（）while sitting stationary in the earth’s magnetic field.
Which compensates for errors introduced when the vessel heels over（）.
When changing from a compass course to a true course you should apply（）.
When relieving the helm，the new helmsman should know the（）.
The Flinders bar and the quadrantal spheres should be tested for permanent magnetism at what interval（）.
By convention，the north seeking ends of a compass’ magnets are colored（）.