A GPS watch uses wrist-top Global Positioning Satellite (GPS) technology to provide a convenient mapping device for adventure enthusiasts. Unlike separate GPS units, the GPS watch is worn on the wrist and doubles as a watch. One popular model by Suunto also includes integrated chronograph, compass, barometer, altimeter and thermometer functions. Fitting GPS technology into a wrist-top device that is easy to use and consumes little power takes creative engineering and ingenuity. Models differ as to features, but in general a GPS watch is targeted towards serious hikers, climbers, bicyclists, boaters, and adventurers.

The GPS watch uses satellite triangulation to determine the exact position of the wearer, normally within a few feet (about 1 meter). By checking your position periodically, the GPS watch calculates distance traveled and rate of speed, including rate of ascent when applicable. Marking waypoints, or distances to existing waypoints, are part of the feature set. A good GPS watch will ensure you stay on the trail even when nature has obscured landmarks, or intersecting paths make it difficult to follow. A GPS watch with a built-in compass can be a true life saver to anyone who travels off the beaten path.

One feature to watch for when considering a GPS watch is PC integration. By using proprietary software, an integrated GPS watch can download or upload maps. Along these lines, the Suunto GPS watch also boasts compatibility with National Geographic's online Topo mapping service. Users from all over the world can upload and download maps for biking, backpacking, paddling and more.

A PC-enabled GPS watch can also be a great training tool. Just upload consecutive logs from your GPS watch to your PC and the software will analyze and compare your performance. Based on the results, you can plan your next excursion, map it out, and upload it to your GPS watch for your next trip.

While Casio was reportedly the first to get a GPS watch to market, the design of this pioneering device was rather bulky. Current models are quite attractive, taking the form of multi-mode digital sports watches. Prices range according to model and features, but Suunto's high-end GPS watch mentioned in this article runs just shy of US$500 as of Spring 2006. Whether or not prices fall over time might largely depend on demand in this highly lucrative niche market.