I have a Casio solar powered watch. Pretty cool. Gives me an alarm, altimeter, barometer, multiple time zones (I travel a lot, so I actually use that function often) and never needs winding, batteries or love.

The altimeter is pretty accurate for contouring around mountains for example--but it only takes a reading every couple of minutes. ON foot, this isn't a problem, but in a car you are traveling faster than it can adjust...
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