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
What is used to correct for both induced and permanent magnetism，and consequently must be readjusted with radical changes in latitude（）.
What is the basic principle of the magnetic compass?（）
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（）.
What is the name of the movable，radial guide line used to measure direction on a radar?（）
Variation in a compass is caused by（）.
When crossing the magnetic equator the（）.
The most accurate method of determining gyrocompass error while underway is by（）.
What are the only magnetic compass correctors that correct for both permanent and induced effects of magnetism?（）
What is an advantage of the magnetic compass aboard vessels?（）
Which magnetic compass corrector（s）can be set while the vessel is on a heading of magnetic north or magnetic south（）.