The Venture SR-2 is designed primarily for sailboats 16' to 36' in length. SR-2 Venture Sailboat Compass Features:• 3-3/4" CombiDial• 12V green LED night lighting• 4-5/8" to 4-13/16" mounting hole• Vertical mounting angle through 40°• Clinometer (INC-45) included• Steady quick lock-on performance• Protective front & back covers are included• 5-year warranty Includes Clinometer Protected by front & back covers | Ritchie SR-2 Venture Bulkhead Mount Sailboat Compass With Clinometer in Green