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 magnetism in the various structures of a ship changing as a result of cruising，vibration，or aging is termed（）.
The MOST important feature of the material used for making the binnacle of a standard magnetic compass is that it is（）.
What are the only magnetic compass correctors that correct for both permanent and induced effects of magnetism?（）
The Flinders bar on a magnetic compass compensates for the（）.
When crossing the magnetic equator the（）.
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.
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.
Which magnetic compass corrector（s）CANNOT be set on a heading of magnetic east or magnetic west（）.
Any piece of metal on becoming magnetized will develop regions of concentrated magnetism called（）.