Quote:
Originally Posted by markem
Altimeters are affected by atmospheric pressure. You need to recalibrate it any time the barometer moves much, etc. 100 feet is not much for an altimeter to be off. You need to have a solid place of known elevation for calibration within relatively short range of where you want the altimeter to read properly. You don't just set-and-forget an altimeter.
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Do you know of a certified elevation near your house. I use to have a bike computer with altimeter built in. I found the "official elevation" of my driveway and would reset the altimeter each ride if it was off.