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Garmin GPSmap 62S
$450, 7.5 oz (inc two AA batteries), www.garmin.com
If you’d rather be found than lost, a GPS unit (provided you learn how to use it, and have good batteries) makes an indispensable tool, and the GPSmap 62s offers a passel of features a trail runner will appreciate, including an electronic compass and barometric altimeter. Even in the densest forest, the high-sensitivity antenna pinpoints your location, and while the unit includes basic maps, you can add topo maps, and plot and share (even wirelessly with compatible Garmin units) your trail adventures.