A.An agonic line
B.The magnetic equator
C.A magnetic meridian
D.All of the above
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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
A.Black
B.Blue
C.Red
D.White
A.flux
B.poles
C.magnets
D.azimuth
最新試題
What is the basic principle of the magnetic compass?（）
What is an advantage of the magnetic compass aboard vessels?（）
When adjusting a magnetic compass using the fore-and-aft permanent magnets，you should（）.
The MOST important feature of the material used for making the binnacle of a standard magnetic compass is that it is（）.
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.
The line which connects the points of zero magnetic dip is（）.
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（）.
When a vessel changes course from one cardinal heading to another cardinal heading whilea djusting the compass，which action should be taken?（）
Which statement about the Flinders bar of the magnetic compass is CORRECT（）.