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Palm-size, lightweight, and waterproof, Garmin's eTrex Summit is a 12-channel handheld global positioning satellite (GPS) receiver. The Summit's easy-to-use menu lets you create and view waypoints, save and view track logs, calibrate the compass and altimeter, and access setup features, among others. Its trip and elevation computers calculate a range of data including direction of movement; total and average ascent and descent; current, average and maximum speeds; trip odometer--and much more. The five user buttons located on the unit's sides allow for simple single-handed operation. Even in dense cloud cover or bad weather, the Summit maintains its lock on available satellites. Garmin's TracBack feature reverses your track log, helping you navigate your way back. Its graphical user interface quickly and easily identifies your marked waypoints--up to 500. During normal operation, the Summit runs for up to 16 hours on two AA batteries and up to 22 hours when in battery-save mode. It has a built-in antenna and an external power/data connector.
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