To navigate 75 miles of gorgeous but punishing chaparral, I've brought along a Garmin Colorado 400t GPS unit, with which I've electronically marked the water caches I buried earlier in the week while driving across the park. If I fail to find even one of these caches, I will wind up very miserable or worse. Also on my utility belt is an ACR Microfix 406 Personal Locator Beacon. Essentially one big panic button, when activated the unit sends a signal to a station monitored by the Air Force, which in turn mobilizes search-and-rescue resources.
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