Fenix 5 - baro/alti crazy reading

Garmin think I'm going to the Space Station
ciq.forums.garmin.com/.../1305503.jpg

Heres my brand new piece of crap watch. ciq.forums.garmin.com/.../1306476.jpg

but base press is solid, guess it's the cal reference pressure?

Correct. This is the pressure which is shown as Barometric Pressure on the watch.

The pressure which is moving around constantly is shown as Ambient Pressure on the watch (with some smoothing, I believe).

I am having the exact same issue with my Fenix 5. The barometer and altimeter are all over the place. I have set my altimeter to 211' as I don't need to know my elevation for my rides and still my barometer is way off (36.29" vice actual (fm Weather Service) 29"). I manually calibrate it and within 10 minutes it is back to being off.

Garmin FIX THIS!

Similar problem... I went for a short run with constant elevation at around ~10m. After finishing, when I looked at the data it indicated an elevation gain of >700m. The temperature was all wrong, at -30C!!! Then, I monitored the watch and the temperature fluctuated between -40C and -25C. The altitude skyrocketed to 20,000m. I tried synchronizing the watch, resetting, etc, and nothing. Later on, the temperature, pressure and altitude all went to "--" (no data shown).

The watch was bought less than two weeks ago. It has suffered no damage. I called Garmin USA but they won't replace because the watch was bought in EU, and now it is to me to deal with EU although I am not based there... Thanks Garmin.

Recently, the watch has started to show temperature/pressure/altitude data again. The temperature started at around 0C and escalated to ~20 (correct temperature) in a period of several hours. The altitude went from ~15000m to -100m, and then started increasing again. Right now, altitude is at 4300m. The correct one should be 10m...

Again, I tried restarting the watch, resetting it, updating firmware, putting the watch in water, etc.

Garmin fix this asap!

. I have set my altimeter to 211' as I don't need to know my elevation for my rides

I found this statement confusing. Is the 211' the correct altitude for your location?

If you input a wrong altitude, you will get a wrong barometric pressure shown in the watch.

My elevation is 211 feet as recorded by an aeronautical website for the local airport. So it is correct. Before I set the altitude, it was showing my elevation to be well over 1000 feet and the barometer swung wildly. I set the altitude to see is that would steady out the barometer. It did not.

Same issue here. I tried all the fixes proposed here, but nothing seems to help. On days I work from home (with zero steps involved) I get between 50 to 100 climbed stairs. Really frustrating - and it only started recently for me. For 1 1/2 years with my Fenix 5s all was good. I wonder if it is a software issue that will be fixed soon or if I should send my Fenix in. Upgdaring to the latest beta firmware (12.51) did not make any difference either.

I have been following a lot of this on the VA3 (Why I switched to the F5 flagship) on here, and a few other devices Garmin sells. Very similar failures. This is starting to sound like a sensor device that fails easily. It is likely something like this: https://www.digikey.com/product-detail/en/bosch-sensortec/BME280/828-1063-1-ND/6136314 and why all those values go nuts when it fails, not just pressure. I don't think humidity is accessible. There are better sensors in the line-up, but I would expect a consumer device is using the least expensive one it can.

Anyhow, I am willing to bet that is is failing hardware, and may not be Garmin's fault apart from selecting a sensor that fails often.