A.measuring the thickness of the tail shaft liner
B.taking the vessel's offsets to check for hull deformation
C.testing and examining the anchor cables for defective links
D.drilling or sonic-testing the hull to determine the plate thickness
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A.Its accuracy remains the same at all latitudes
B.It seeks the true meridian
C.It can be used near the Earth's magnetic poles
D.If an error exists，it is the same on all headings
A.It compensates for the error caused by the vertical component of the Earth's magnetic field
B.It compensates for error caused by the heeling of a vessel
C.It compensates for quadrantal deviation
D.It is only needed in equatorial waters
A.Heeling magnet
B.Flinders bar
C.Fore-and-aft magnets
D.All of the above can be set on magnetic east or magnetic west headings
A.Quadrantal spheres
B.Heeling magnets
C.Flinders bar
D.Fore-and-aft magnets
A.The soft iron spheres on the arms of the binnacle
B.Magnets placed in trays inside the binnacle
C.A single vertical magnet beneath the compass
D.The Flinders bar
最新試題
When adjusting a magnetic compass using the fore-and-aft permanent magnets，you should（）.
This induced magnetism（）the permanent magnetism already present in the ship.
What are the only magnetic compass correctors that correct for both permanent and induced effects of magnetism?（）
When adjusting a magnetic compass for error，a deviation table should be made（）.
What is an advantage of the magnetic compass aboard vessels?（）
The MOST important feature of the material used for making the binnacle of a standard magnetic compass is that it is（）.
Variation is a compass error that you（）.
Any piece of metal on becoming magnetized will develop regions of concentrated magnetism called（）.
The variation for most given areas undergoes（）change，the amount of which is also noted on charts.
The quadrantal spheres are used to（）.