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
Variation is a compass error that you（）.
By convention，the north seeking ends of a compass’ magnets are colored（）.
What is an advantage of the magnetic compass aboard vessels?（）
What is the basic principle of the magnetic compass（）.
When adjusting a magnetic compass using the fore-and-aft permanent magnets，you should（）.
Which compensates for errors introduced when the vessel heels over（）.
The Flinders bar on a magnetic compass compensates for the（）.
What are the only magnetic compass correctors that correct for both permanent and induced effects of magnetism?（）
The magnetism in the various structures of a ship changing as a result of cruising，vibration，or aging is termed（）.
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.