For the past couple of months, I have been using the eTrex Solar for hiking, trail riding, and geocaching activities. This GPS handheld provides up to 200 hours of GPS navigation with no solar charging; in an area with 75,000 lux sun -- bright sunlight -- the battery is advertised as providing unlimited GPS navigation support. I haven't been in an area with that much sun, so I haven't been able to test for unlimited life.
The eTrex Solar is intuitive to use with five large buttons covered in soft touch material and a small monochrome display, which may limit some navigation functionality but offers ease of use in rugged conditions.
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