Since it's packed with an accelerometer, a 3-D compass, and an altimeter, and built to be abused, the Suunto Ambit is aimed at high-altitude, hard-charging trail runners, climbers, and hikers. In the field, its GPS repeatedly locked in quicker than that of comparable watches, and its accelerometer was responsive and accurate. The recovery-time calculator is cool, too. [$500; suunto.com]
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