The most important criteria when selecting a compass are dial size and mounting style. Quality components aid accuracy, smooth response, stability and trouble-free operation. RITCHIE NAVIGATIONs Explorer Compass F-50 is for marine use and is black with a black Direct-Read dial. This compass is easy to install on your marine vessel with the provided surface mount! It features 2-3/4" Direct-Read dial, flush mount, Hardened Steel Pivot Movement, Sapphire Jewel Movement, high temperature composite construction for extended operating range and internal green Intevac illumination. This compass is 100% repairable and has a 5-year .