Keep tabs on your swim training effortlessly with the Garmin Forerunner 310XT Multi-Sport ($350). The GPS-enabled 310XT tracks speed, distance and location on both land and water to a depth of 50 meters. The 310XT also features hear rate-based calorie computation, 20-hour battery life, a large, easy-to-read display and an automatic wireless data transfer to a PC or Mac.
