Magnetic variation changes with a change in（）.

单项选择题Magnetic heading differs from compass heading by（）.

A.compass error
B.true heading
C.variation
D.deviation

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（）.

A.varies depending upon the bearing used
B.is the angular difference between magnetic north and compass north
C.is published on the compass rose on most nautical charts
D.is the angular difference between geographic and magnetic meridians

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（）.

A.into the wind
B.away in fire and smoke
C.directly to the standby boat
D.directly to the nearest land

单项选择题Indications of the master gyrocompass are sent to remote repeaters by the（）.

A.follow-up system
B.transmitter
C.phantom element
D.azimuth motor