单项选择题
The lubber’s line on a magnetic compass indicates（）.
A.compass north B.the direction of the vessel's head C.magnetic north D.a relative bearing taken with an azimuth circle
单项选择题 The lubber’s line of a magnetic compass（）.
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（）.
