单项选择题
Deviation is the angle between the（）.
A.true meridian and the axis of the compass card B.true meridian and the magnetic meridian C.magnetic meridian and the axis of the compass card D.axis of the compass card and the degaussing meridian
单项选择题 Error may be introduced into a magnetic compass by（）.
单项选择题 Gyrocompass repeaters reproduce the indications of the master gyrocompass. They are（）.
单项选择题 How is variation indicated on a small-scale nautical chart?（）.
