Forerunner 310XT GPS sport watch by Garmin: Purchase a Garmin Forerunner 310XT and receive $50USD via mail-in rebate. Offer is valid for purchases made between 10/09/09 and 12/31/09. Rebate submissions must be postmarked by 01/30/10. Limit one rebate per customer. Finally, a GPS-enabled training device that isn’t afraid of the water. The rugged Forerunner 310XT is the triathlete’s indispensable training tool – a GPS-enabled trainer that is water-resistant to 50m, tracks bike and run data and sends it wirelessly to your computer. This multi-sport device has up to 20 hours of battery life, tracks distance, pace and heart rate (optional), and goes from wrist to bike in seconds. The Forerunner 310XT is waterproof to a depth of 50 meters, so you can wear it in the pool or the lake to time your swim. And its slim design and flexible wristband mean Forerunner is easy to wear in any conditions. When you’re ready to jump out of the water and onto the bike, Forerunner 310XT moves easily from wrist to bike with the optional quick release and bike mounts, making the transition between sports effortless. Forerunner 310XT categorizes multisport activities in one workout and can also log transition time in the process, so you can analyze your performance from start to finish.