I then did a classic test where you manually calibrate the altimeter to a value off the actual one, start an activity and hopefully auto calibration will adjust the altimeter. Coros worked well. Fenix 7 after 3:30 hours of the watch sitting in the window, with the GPS altimeter showing the correct altitude, never adjusted the barometric altimeter. These have nothing to do with my problem. I don't want it to calibrate automatically during the night. Previous Fenix watches didn't do it. I want it to calibrate at start and during activity. Also, altimeter or barometer mode is a completely different topic. Hello, today I upgraded the firmware with version 22.20, which promised better accuracy of the altimeter; Instead, I immediately realized that after the update the altimeter (which previously worked very well, with very rare errors) presented a series of malfunctions that I list here: 1- non-continuous but only sporadic updates: the watch indicates the same altitude for a certain time even I noticed that my Fenix 3 HR got confused in climbing stairs but eventually I worked out that the issue is more about movement while climbing - it won’t see elevators or escalators if climbed stairs / storeys and I had noted that it saw me descending stairs quite accurately but seldom climbing, with a Little thought on the matter I concluded that my consistent use of the handrail on stairs When I bought a used Garmin Fenix 5x, I first calibrated the barometer manually, in my place I set the barometric pressure accurately via accu weather. Then I saw on Google Earth (at the bottom right corner you have the coordinates and exact altitude!) manually calibrated the altitude. Well like the previous poster, I talked to Garmin, and they deduced the barometric sensor was broken. They are doing a RMA for me. They provided a return shipping label and will send a replacement Fenix 5 (hopefully with a working barometric sensor). A bit of a drag since I had it only a month before it failed. Hopefully the new one doesn't fail. A dedicated community for Garmin users to ask questions, provide answers, and share feedback. fēnix 6 Series 9.0.0 and sensor hub 5.0.7 altimeter issues during RE: Fenix 5 - Altimeter/Barometer Major Issues There was a post on another forum that claims that previous way-points are used as part of the activity start elevation fix if available. For the Fenix 3, this was proved not to be the case. Sharing a Garmin Connect Activity. Troubleshooting the fenix Chronos and fenix 5 Series Altimeter and Barometer. If the issues are persisting please try the test below and advise us if the local and base values change at all. Power off the watch; Press and hold Down; Press and release Power, continue to hold down; Once in test mode, press Back Similar problems with MTB (where speed is less an issue, but elevation gains are more meaningful). With 4.20 on a 5 Plus Sapphire I experienced some improvement with the altimeter: round-trips show now the same elevation at the beginning and at the end of the ride (with 3.20 I had deviations of up to 250 meters after 3 hours!). Rngp.