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 crossing the magnetic equator the（）.
Which magnetic compass corrector（s）can be set while the vessel is on a heading of magnetic north or magnetic south（）.
What is an advantage of the magnetic compass aboard vessels?（）
The variation for most given areas undergoes（）change，the amount of which is also noted on charts.
What is the basic principle of the magnetic compass?（）
The most accurate method of determining gyrocompass error while underway is by（）.
When changing from a compass course to a true course you should apply（）.
Any piece of metal on becoming magnetized will develop regions of concentrated magnetism called（）.
The quadrantal spheres are used to（）.
Which compensates for errors introduced when the vessel heels over（）.