单项选择题
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
单项选择题 Which statement about the Flinders bar of the magnetic compass is CORRECT（）.
单项选择题 Which magnetic compass corrector（s）CANNOT be set on a heading of magnetic east or magnetic west（）.
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（）.