Navigator CompassFeatures:4 1/2″ (115 mm) Ritchie CombiDial and Built-in InclinometerWhen mounting this Compass to a bulkhead that is NOT perpendicular (90° angle) to the center-line of the boat and/or NOT vertical (90° angle) to the waterline of the boat (boat on level keel), a fairing block MUST be used to make the compass so.Easily Installed, Fits 5.75″ (146 mm) Mounting HoleInternal Gimbal Systems for Maximum Stability During Adverse Pitch and Roll ConditionsScientifically Matched Sapphire Jewel and Hardened Steel Pivot Dial MovementFiberglass Reinforced Bowl45 degree Lubber LinesExclusive Built-in 12v Amber LED LightingBuilt-in Compensators to Easily Adjust for Deviation100% RepairableExclusive 5-Year Ritchie WarrantyApprox. Shipping Weight: 2 lbs 5 oz (1.05 kg)Notes:12v lighting standard - 24 & 32v lighting options are available.