单项选择题
At the magnetic equator there is no induced magnetism in the vertical soft iron because（）.
A.the lines of force cross the equator on a 0°-180°alignment
B.the quadrantal error is 0°
C.there is no vertical component of the Earth's magnetic field
D.the intercardinal headings have less than 1°
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A.buoys close at hand
B.fixed known objects on shore
C.buoys at a distance
D.All of the above -
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A single line of position combined with a dead-reckoning position results in a(n)（）.
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A relative bearing is always measured from（）.
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