great test on a lake! no wondering if you 'think it is level.' i've
always been suspicious of the altitude feature of my garmont/timex unit.
people who really care about elevation use an altimeter. some units
come with a 'barometric' altimeter built in. however, on one circuit
hike of afton state park, a unit with an altimeter placed the parking
lot at some 50(?) feet higher than when we had started. we wondered if
the approaching storm was enough to lower the pressure that much . . .

jim


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Not hard to imagine, actually. Barometric pressure varies about .1" per
100ft (Not exact, but close enough for eyeballing stuff). A fast moving
front can raise or lower the barometric pressure by several tenths in a
very short time period.
I'm still curious about the update period for the barometric units. I
wonder if they can be accurate enough to handle the short, quick
transitions at somewhere like the Birkie at ski speeds. Hiking, they
certainly should. In any case, they are all cool toys. I'm still not
sure I'll take it to the BWCA next week, though.

Marsh