Professional marine compass by Ritchie Navigation (OEM 51W). Precision DirectiveForce magnet system provides stable accurate readings in all sea conditions. White PowerDamp dial with bold easy-read graduations visible day and night. 3-inch dial size perfect for sailboats and powerboats up to 30 feet. Bracket mount design allows flexible installation on dash, bulkhead, or binnacle. Built-in compensators for easy magnetic deviation adjustment. Rugged construction with impact-resistant housing built for harsh marine environments. Sealed design prevents moisture and salt intrusion. Includes green night lighting for low-light navigation. Trusted Ritchie quality ensures reliable performance for safe navigation.