A.an annual
B.a constant
C.a variable
D.an unstable
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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
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
最新試題
The most accurate method of determining gyrocompass error while underway is by（）.
Any piece of metal on becoming magnetized will develop regions of concentrated magnetism called（）.
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.
When a magnetic compass is not in use for a prolonged period of time it should（）.
The quadrantal spheres are used to（）.
By convention，the north seeking ends of a compass’ magnets are colored（）.
What is an advantage of the magnetic compass aboard vessels?（）
Which statement about the gyrocompass is FALSE（）.
The MOST important feature of the material used for making the binnacle of a standard magnetic compass is that it is（）.