单项选择题
A.always shows true north direction
B.indicates the vessel's heading
C.is always parallel to the vessel's transom
D.is located on the compass card
单项选择题 The horizontal angle between the magnetic meridian and the north-south line of the magnetic compass is（）.
单项选择题 The gyrocompass error resulting from your vessel’s movement in OTHER than an east-west direction is called（）.
单项选择题 The greatest directive force is exerted on the magnetic compass when the（）.