单项选择题

Which statement about the gyrocompass is FALSE（）.

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

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单项选择题

Which statement about the Flinders bar of the magnetic compass is CORRECT（）.

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

单项选择题

Which magnetic compass corrector（s）CANNOT be set on a heading of magnetic east or magnetic west（）.

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

单项选择题

Which magnetic compass corrector（s）can be set while the vessel is on a heading of magnetic north or magnetic south（）.

A.Quadrantal spheres
B.Heeling magnets
C.Flinders bar
D.Fore-and-aft magnets