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
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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
A.Induced magnetism in vertical soft iron
B.Induced magnetism in horizontal soft iron
C.Permanent magnetism in ship's steel
D.Vessel's inclination from the vertical
A.GPS
B.GMDSS
C.AIS
D.Navtex
最新試題
What is an advantage of the magnetic compass aboard vessels?（）
Which magnetic compass corrector（s）CANNOT be set on a heading of magnetic east or magnetic west（）.
What are the only magnetic compass correctors that correct for both permanent and induced effects of magnetism?（）
When changing from a compass course to a true course you should apply（）.
The line which connects the points of zero magnetic dip is（）.
The MOST important feature of the material used for making the binnacle of a standard magnetic compass is that it is（）.
By convention，the north seeking ends of a compass’ magnets are colored（）.
The magnetism in the various structures of a ship changing as a result of cruising，vibration，or aging is termed（）.
Variation is a compass error that you（）.
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.