Just get rid of the barometric readings from the data. They really just don't add any value unless you go to immense effort to normalize them hourly against the weather etc..
A typical hike might run three hours, and I always calibrate the GPS to a known altitude at the beginning. I'm probably getting better accuracy from the barometric readings than I am from the satellites, because just about half of my waypoints are down in arroyos. Garmin by default uses the barometric readings, you have to dig into the menu structure to even find the GPS elevation readings.
tanstaafl.
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