Altimeter is always off after starting an activity

d0f3274d6535438a93926190b1a7aa82 1 month ago

After starting a running activity the altimetry drops drastically after the first kilometers even on a flat terrain. I calibrate it every time before starting it. It didn´t happen a year ago.

0 RDW 16 days ago

Same, it was never perfect but used to be much better.
Even manually calibrating via the correct, known pressure and altitude, most of my runs and hikes finish 50-60m elevation different to the starting value.

Disabling the auto update altimeter doesnt seem to fix it either - even full manual with no GPS/DEM update has the issue. Its a software change made at some point.

0 Garmin - AL 11 days ago

If you believe the elevation reading from your watch is incorrect, review the following information to help troubleshoot and fix the problem:

Elevation Reading on Forerunner 255 Series Is Wrong

0 d0f3274d6535438a93926190b1a7aa82 11 days ago in reply to Garmin - AL

Thanks for the information. I followed the same steps even before being shared here and keeps flailing. It is clear a software issue. The altimetry always changes drastically during the first minutes of the activity.

0 RDW 10 days ago in reply to Garmin - AL

The elevation is correct OUTSIDE activities as is the barometric pressure.
The issue is during activities it drifts significantly and always adds huge amounts of extra elevation gain.
The sensor itself is fine as verified manually via the correct pressure data on a weather station and elevation from a map.