A.They are not subject to permanent magnetism; no check is necessary
B.Semiannually
C.Annually
D.Every five years
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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
A.If the blue ends of the magnets are aft，and the fore-and-aft tray is at the top，you should add some magnets
B.If the blue ends of the magnets are aft you should lower the fore-and-aft tray
C.If the blue ends of the magnets are aft，and the fore-and-aft tray is at the top，you should reverse the magnets
D.If the blue ends of the magnets are forward，and the fore-and-aft tray is at the bottom，you should add some magnets
最新試題
When changing from a compass course to a true course you should apply（）.
Which magnetic compass corrector（s）CANNOT be set on a heading of magnetic east or magnetic west（）.
While in drydock your vessel will be belt-gauged.This process involves（）.
By convention，the north seeking ends of a compass’ magnets are colored（）.
When a magnetic compass is not in use for a prolonged period of time it should（）.
The line which connects the points of zero magnetic dip is（）.
When crossing the magnetic equator the（）.
When a vessel changes course from one cardinal heading to another cardinal heading whilea djusting the compass，which action should be taken?（）
Variation is the angular measurement between（）.
What are the only magnetic compass correctors that correct for both permanent and induced effects of magnetism?（）