When adjusting a magnetic compass using the fore-and-aft permanent magnets,you should().
Compass error is equal to the().
What are the only magnetic compass correctors that correct for both permanent and induced effects of magnetism?()
Compass deviation is caused by().
My gyro-compass error is().
The compass error of a magnetic compass that has no deviation is().
()the repeater compass with the master compass,please.
Variation is a compass error that you().
At that time my ship and others were()within 40 degrees of the compass.
Deviation in a compass is caused by the().