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
When crossing the magnetic equator the（）.
When adjusting a magnetic compass using the fore-and-aft permanent magnets，you should（）.
A ship under construction or major repair will acquire permanent magnetism due to（）while sitting stationary in the earth’s magnetic field.
The Flinders bar and the quadrantal spheres should be tested for permanent magnetism at what interval（）.
The quadrantal spheres are used to（）.
When a magnetic compass is not in use for a prolonged period of time it should（）.
What is used to correct for both induced and permanent magnetism，and consequently must be readjusted with radical changes in latitude（）.
The magnetism in the various structures of a ship changing as a result of cruising，vibration，or aging is termed（）.
The Flinders bar on a magnetic compass compensates for the（）.
When a vessel changes course from one cardinal heading to another cardinal heading whilea djusting the compass，which action should be taken?（）