Elevation adjustment

Rumpole · January 8, 2014 10:50AM

OK-this is really more of a garmin question, but as I was looking over some old power files from the past year for 50 mile rides, and when I allowed "elevation correction" on garmin, the gain changes from 2900 feet to 5300. That's nearly double. Any idea which one might be right? I'm asking this as I start looking at races and their elevation profiles.

Al Truscott · January 8, 2014 12:41PM

Beware comparing cumulative elvation gains from various sources. It depends on how frequently the calculus algorithm measures a change. Usually, GPS measure more often than a barometer, which measures more often than map based, like mapmyride. So you'll see things like a course which is 8500' gain from a GPS, 6500' from a barometric measure, and 4500' from a map.

Bryan Davis · January 8, 2014 2:21PM

The picture below is not to be confused with an actual recommendation.

High Altitude Simulation Training Mask

Rumpole · January 9, 2014 9:43AM

Al-

Do you know which one Garmin Connect uses? GPS? For example, a 25 mile route that I ride routinely will come out at either 925 feet or 2500 ("corrected"). I honestly have no idea which one is right.

Here's an example: http://connect.garmin.com/activity/338320873

scott dinhofer · January 30, 2014 4:23AM

This is a great article on the subject
http://www.dcrainmaker.com/2010/05/understanding-sport-device-gps.html

Elevation adjustment

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