Garmin GPS Watch – The Garmin Forerunner 310 XT is a waterproof running and biking GPS watch that is marketed as the triathlete’s dream device. It boasts quite an extensive list of features that are not found on many other products of its type. This gadget allows a trainer to track position, distance, and pace. By adding the appropriate accessories, namely a Garmin Premium Heart Rate Monitor and a Garmin GSC 10 Speed/Cadence Bike Sensor, the trainer is also able to track heart rate and power data. The Garmin Forerunner 310 XT is one of the most advanced designs for a product of its type. Although there are quite a few flaws perceived in that design, the vast majority of users of this device seems to be very satisfied with it.