How to Repair a Compass

Your boat's compass is one of the most important tools for navigating the high seas. Though most compasses are mounted on a console near the steering column for easy reference, some are built small for easy transport or relocation. Compasses are built for ruggedness, but minor problems can occur. Over time and after a lot of sun exposure, the compass's dome may begin to leak, allowing an air bubble to form. Filling the air bubble with additional compass oil is a common and relatively simple repair.

Things You'll Need

  • Screwdriver
  • Compass oil
  • Plastic syringe
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Instructions

    • 1

      Locate the filling screw on the side of your compass. On some models, the filling screw may be on the front or back side of the compass.

    • 2

      Lift the compass and turn it so the filling screw faces up. Loosen and remove the screw using a screwdriver.

    • 3

      Insert the tip of a plastic syringe into the bottle of compass oil. Pull up the plunger of the syringe until it fills completely with oil.

    • 4

      Place the tip of the syringe into the filling port and depress the plunger. Watch the dome of the compass to see the air bubble diminish.

    • 5

      Repeat steps 3 and 4 until the air bubble vanishes.

    • 6

      Replace and tighten the filling screw. Turn the compass so that the dome faces up. Shake the compass gently from side to side to ensure that the bubble is fully filled. If it reappears, repeat steps 3 and 4.