I had (RIP) a ski buddy who was nuts about how many vertical feet he
could get in x time. He had some kind of barometer/recorder. I
measure my skiing in fun/yard sales/injuries.
This is a (used) prototype of the first GPS watch (needs a battery and
It'll get you within 100 yards, horizontally, under any conditions
where you have sufficient landmarks to triangulate a position, like,
on top of a mountain.
On top of a mountain, at night, it's still nearly as good as anything
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