单项选择题
The gyrocompass error resulting from your vessel’s movement in OTHER than an east-west direction is called（）.
A.damping error B.ballistic deflection C.quadrantal error D.speed error
单项选择题 The greatest directive force is exerted on the magnetic compass when the（）.
单项选择题 The Flinders bar on a magnetic compass compensates for the（）.
单项选择题 The error in a magnetic compass caused by the vessel’s magnetism is called（）.
