Aug 22, 2013 10:31 AM
Keep track of the time when you're well outside of cell tower range with this Portable Sun Dial ($11). Just calibrate it with the built-in calendar, align it, and it'll help you determine whether you've got enough time to hit that next summit, or whether you ought to head back to the parking lot before the rangers send a helicopter after you.
(Yes, we know a watch works pretty well for this too - but how much less fun is that?)
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