单项选择题
A.compass north B.the direction of the vessel's head C.magnetic north D.a relative bearing taken with an azimuth circle
The lubber’s line of a magnetic compass（）.A.always show...
单项选择题The lubber’s line of a magnetic compass（）.
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
The horizontal angle between the magnetic meridian and ...
单项选择题The horizontal angle between the magnetic meridian and the north-south line of the magnetic compass is（）.
A.deviation B.variation C.compass error D.dip
The gyrocompass error resulting from your vessel’s move...
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
