What are operational checks carried out in magnetic compass?

 The performance of all magnetic compasses, including spares should be checked as follows:

1. Freedom of movement of the gimbal.
2. Card floating freely and level, and rotating without any friction.
3. Liquid free of bubbles and clear.
4. Compass card clear and sharp (able to be read) with no distortion or discoloration.
5. Optical system (if any) correctly adjusted and clean.
6. Azimuth reading devices and means of illumination in working order.
7. No liquid leaks around seals or filler plugs.

 The compass deviation records and the deviation card for each magnetic compass installed on the ship should be checked.