Suunto's top-of-the-line sailing watch, the Suunto M9 is an invaluable tool for racing, open sea navigation, or casual sailing. The Suunto M9 employs GPS technology to determine your position at all times, mark waypoints and to track speed, distance and direction. Suunto has also loaded the M9 with serveral important tactical race functions. The M9 detects changes in wind direction and provides you with the information you need to take the shortest route to your destination. The 3D compass allows the M9 to provide exact bearings regardless of the inclination of the instrument while automatically compensating for magnetic variation. The M9 includes Suunto's barometric pressure tracking function to allow you to anticipate changes in weather conditions. The Li-ion battery is rechargable and the GPS will function continuously for about 5 hours. The M9 also has a mineral glass crystal,