Venture Bulkhead Combidial Compass. TheVenture SR-2 is designed primarily for sailboats 16′ (4.88M) to 36′ (10.68M) in length. , Venture Bulkhead Compass Features: 3-3/4″ CombiDial, 4-5/8″ (118mm) to 4-13/16″ (122mm) mounting hole, Blue LED Night Lighting, Adapter plate (BK-0034) 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,