Place the compass on a wooden table, rotating the compass so that North is lined up with the forward lubbers line. The compass MUST return to the original heading. Whenever you get a bubble in your compass, it is an indication of a failure in your sealing system. A bubble in almost all cases requires a trip to the repair shop. Do yourself a cost saving favor, when you get a bubble do not wait to get it repaired.
Estimates are free, and repair work is warranted for a period of ONE year.
Only factory authorized parts are used in all repairs.