GPS watches, like the Garmin Forerunner, keep tabs on you through Global Positioning Satellites so you can accurately measure distances and speeds you've traveled. Plus, you'll always be able to find your way back to your starting point: a hotel in a new city, a spot along a racecourse, or a campsite in the wilderness. GPS watches do the mapping for you and let you focus on your workout instead of your location.
Garmin GPS navigators strap on your wrist and look a little bigger than the average watch, but they are lighter–only 2 and a half ounces–and keep your hands free for more important things. They store extensive navigational data, including waypoints and reverse routes, as well as years' worth of personal workout information. With an easy-to-use interface, you can track your location or your exercise history in a snap.
GPS Watches are Digital Descendents of the Stopwatch
Stopwatches have developed quickly over the past few years. At first, they simply timed sporting events, then–with the advent of digital technology–they could time multiple events. Now, they are microcomputers and can calculate how many calories you've burned or steps you've taken. Add a GPS sensor to track your location, and they can accurately determine distances you've traveled and your speed, too.
Just because they are high-tech doesn't mean they are dainty. Some GPS watches, like the Garmin Foretrex, are waterproof–you can submerse them for up to 30 minutes. It also includes an application for timing paragliding and sailing races. These rugged GPS watches are meant to be used–strap one on and get going.