单项选择题
Magnetic variation changes with a change in（）.
A.the vessel's heading
B.sea conditions
C.seasons
D.the vessel's position
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相关考题
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单项选择题
Magnetic heading differs from compass heading by（）.
A.compass error
B.true heading
C.variation
D.deviation -
单项选择题
Magnetic dip is a measurement of the angle between the（）.
A.geographic pole and the magnetic pole
B.lubber's line and true north
C.horizontal and the magnetic line of force
D.compass heading and the magnetic heading -
单项选择题
Magnetic compass deviation（）.
A.varies depending upon the bearing used
B.is the angular difference between magnetic north and compass north
C.is published on the compass rose on most nautical charts
D.is the angular difference between geographic and magnetic meridians
