The compass error of a magnetic compass that has no deviation is().
A、zero
B、equal to variation
C、eliminated by adjusting the compass
D、constant at any geographical location
A、zero
B、equal to variation
C、eliminated by adjusting the compass
D、constant at any geographical location
A、A.The readings are too low (small numerically) and the amount of the error must be added to the compass to obtain true B、B.The readings are too low and the amount of the error must be subtracted from the compass to obtain true C、C.The readings are too high (large numerically) and the amount of the error must be added to the compass to obtain true D、D.The readings are too high and the amount of the error must be subtracted from the compass to obtain true
A、A.The readings are too low (small numerically) and the amount of the error must be added to the compass to obtain true B、B.The readings are too low and the amount of the error must be subtracted from the compass to obtain true C、C.The readings are too high (large numerically) and the amount of the error must be added to the compass to obtain true D、D.The readings are too high and the amount of the error must be subtracted from the compass to obtain true
A、set it on the centerline of the boat B、apply the correction for compass error C、keep metal objects away from it D、All of the above