单项选择题
Magnetic dip is a measurement of the angle between the（）.
A.geographic pole and the magnetic pole B.lubber's line and true north C.horizontal and the magnetic line of force D.compass heading and the magnetic heading
单项选择题 Magnetic compass deviation（）.
单项选择题 Knowing the compass heading that is 90°to the side of a ship will enable the operator of a survival craft to initially steer（）.
单项选择题 Indications of the master gyrocompass are sent to remote repeaters by the（）.
