Here's what other sites are saying:
Navigate through the backcountry while keeping track of your heart rate, speed and distance as you run, backpack or hike. The BodyLink Trail Runner from Timex does it all. GPS armband and heart monitor chest band transmits data to the wrist-top computer. Digital transmission system protects your data from other heart rate monitors and most exercise equipment. GPS functionality provides latitude, latitude, and directional heading. Altitude/elevation data with ascent and descent rates provided by GPS. Ability to take up to 10 waypoints; trackback mode navigates back to selected waypoint. Pre-set your desired heart rate target zones; alarm notification when you are not in the zone. Measures you recovery heart rate; displays % of maximum heart rate. Continuous odometer keeps track of your total distance for a workout or group of workouts.