The Ritchie S-53 Explorer is designed with a low profile so that it sits flush to your dash without the need to cut a hole. The surface mounted compass includes a 12V green nightlight to help with navigation in low light situations. It also features a 2 ¾ inch direct-read dial, making it easy to use. The compass includes built-in compensators and a scientifically matched sapphire jewel and hardened steel pivot dial movement. The moveable sun shield makes it easier to read the dial at any time of day, and the high-temperature composite construction makes the unit strong and durable.