To maintain the accuracy of your magnetic compass:
- make sure it is located away from electrical interference
- ensure there are no bubbles if it has a wet card
- check for accuracy after any changes are made to the vessel
Gyro compasses should be switched on well before departure and checked often against the magnetic compass.
Any adjustments made must be done by a qualified compass adjuster.
Deviation Tables must be kept up to date, especially after changes in the vessel’s electrical wiring or equipment, or any structural changes to the vessel.