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 adjusting a magnetic compass for error，a deviation table should be made（）.
Which compensates for errors introduced when the vessel heels over（）.
Which magnetic compass corrector（s）CANNOT be set on a heading of magnetic east or magnetic west（）.
The quadrantal spheres are used to（）.
This induced magnetism（）the permanent magnetism already present in the ship.
The variation for most given areas undergoes（）change，the amount of which is also noted on charts.
While in drydock your vessel will be belt-gauged.This process involves（）.
A vessel is heading magnetic east and its magnetic compass indicates a heading of 086°.Which action should be taken to remove this error during compass adjustment（）.
Which statement about the Flinders bar of the magnetic compass is CORRECT（）.
When crossing the magnetic equator the（）.