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
In more recent years，（）has been used by civilians in many new ways to determine positions，such as in automobile and boat navigation，hiking，emergency rescue，and precision agriculture and mining.
Which statement about the gyrocompass is FALSE（）.
Variation is a compass error that you（）.
A ship under construction or major repair will acquire permanent magnetism due to（）while sitting stationary in the earth’s magnetic field.
When changing from a compass course to a true course you should apply（）.
The quadrantal spheres are used to（）.
Which magnetic compass corrector（s）can be set while the vessel is on a heading of magnetic north or magnetic south（）.
When adjusting a magnetic compass using the fore-and-aft permanent magnets，you should（）.
The variation for most given areas undergoes（）change，the amount of which is also noted on charts.
This induced magnetism（）the permanent magnetism already present in the ship.