4-1/2" PowerDamp Plus, high-visibility blue dial with extra large white numeralsEasily installed, fits 4.75" (12.07 cm) mounting holeBuilt-in compensators to easily adjust for deviationScientifically matched Sapphire jewel & hardened steel pivot dial movementInternal gimbal systems for maximum stability during adverse pitch and roll conditionsPowerful directive force magnets for fast heading lock-onExclusive built-in green NiteVu night illumination in movable sun shields45 degree lubber linesHigh temperature construction for extended operating rangeCustom fitted protective covers available100% repairableExclusive 5-year Ritchie warranty