Originally Posted by
rcb78
Something no one has mentioned yet is that the altimeters in the Garmins are not temperature compensated. So if there is a temp change when the unit is not recording, the elevation 'reading' will change while just sitting there. They also do funny things when the weather changes while you're out thanks to the pressure change. The micro climates in the Bay Area really highlight this.
This is what I was thinking about. Did you leave the bike/unit outside or take it inside while you were at the cafe? An abrupt temp change by going into an air conditioned building from the outside might confuse the barometer since it isn't temp compensated. Just a thought.
Bill