5″ Dial. Base Diameter: 6-7/8″ X 19″ X 8-1/4″. PowerDamp Performance Dial. A practical combination of compass and special mounting bracket is offered in this model. Special one piece cast bronze bracket mount model with black finish. Includes quadrantal correction spheres. Bracket mount steel boat. 5″ dial has 2� with points. Built-in semi-circular compensators. Full internal gimbals. Night lighting – 12 volt. High capacity roller diaphragm for extended temperature operating ranges. Hardened steel pivot and sapphire jewel movement. 90� lubber lines for easy reading of reciprocal headings. 100% repairability. Exclusive 5-year Ritchie warranty.