The Bubble isn't just a Bubble
Ok..some liquid or "whiskey" compass facts.Some liquid-dampened compasses are not full filled; some actually have bubbles for reasons and it can depend on the unit's construction. So, having an air bubble in a compass isn't necessarily unusual.Secondly, since this isn't aviation, a person can repair their own liquid-filled compass. Most compass overhaul kits include a gasket, which is why the fluid leaked out, that can be user replaced and the appropriate amount of compass fluid which, by the way, isn't straight mineral oil. Replace the gasket, unscrew the filler cap and pour the liquid in, replace the cap and install the compass.However, you will have to "swing" your compass in order to make sure it's accurate. You can do this simply by steering a set course according to a quality hand-held compass and adjusting the two small screws typically found in the base of your binnacle. Then turn to the four main compass points (N, E, S, W) and make sure they are lined up. Jot that info down. Then, turn on your electronics, turn the boat to the four main points again and notice if there are any deviations compared to the electronics-off readings. You will then have a for/steer sheet, e.g., For 360, Steer 355 when electronics are own. GPS is unaffected by all of this, of course, because GPS sets its position from satellite data.That's the basics of compass repair. Good luck.