单项选择题
Magnetic heading differs from compass heading by（）.
A.compass error
B.true heading
C.variation
D.deviation
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My gyro-compass（）is two degrees east.
A.trouble
B.error
C.wrong
D.mistake -
单项选择题
Your ship is steaming at night with the gyropilot engaged. You notice that the vessel’s course is slowly changing to the right. Which action should you take FIRST?（）.
A.Notify the engine room of the steering malfunction
B.Change to hand steering
C.Call the Master
D.Send the Quartermaster to the emergency steering station -
单项选择题
The principal purpose of adjustment of the magnetic compass is to eliminate（）as far as possible.
A.variation
B.compass error
C.deviation
D.earth's magnetic force
