The Venture SR-2 is designed primarily for sailboats 16 ft. (4.88m) to 36 ft (10.68m) in length. Features Include: 3 3/4" (9.35 cm) CombiDial * 12V green LED Night Lighting * 4 5/8" (118 mm) to 4 13/16" (122 mm) mounting hole. * Adapter plate available to retrofit existing HV-76 and HV-77 installations. * Vertical Mounting Angle Through 40 Degrees. * Clinometer (INC-45) included * Steady Quick Lock-On Performance. * Exclusive 5-Year Ritchie Warranty * Protective Front & Back Covers are Included. * SR-CM2 Compensator module is sold separately.