9 baro altitude problem

[vadafer]

Hi all. I’ve spent a few days reading some posts concerning the altitude calculation, but my problem seems to be quite different. I’ve an Ambit 3 Peak sapphire and a 9 baro.

While the 3 peak is very consistent in terms of keeping the same altitude if leaved on a table for several hours, the 9 baro keeps changing its altitude even after a few minutes form my manual regulation, and changes can concern even 100 + or - differences. This test has been experienced a few times with both watches leaved on the same table (so no under activity circumstances).

That being said, I’m also experiencing extreme differences regarding activity’s elevation. I’ve attached the last activity done yesterday, with my two watches recording very different data (3 peak recorder 430 d+ and d-, which is what Komoot, Suunto and many other router programs states, while the 9 baro recorder a 608 d+ and a 624 d-).

These differences are common during my latests outdoor activities, and I cannot find any reason.

My I consider that my Suunto 9 baro needs to be checked or needs assistance?

Many thanks!

611ec3141327a56a60959f62 (3 peak).fit 611e6e1455fb931b7507c36e (9 baro).fit

[Mff73]

@vadafer
eventually search for “fridge” test in this forum, and contemplate first to clean your S9 baro sensor.

[vadafer]

@mff73
The watch was serviced and they’ve changed the pressure sensor and OHR sensor under warranty. Problem solved

[Pavlas]

Hi,
I don’t want to start a new thread, so I’ll try asking here.
In my last 2 activities (run) I noticed that I have a “hairy” altitude profile. The temperature profile looks clean. Do you know what this could be?

[isazi]

@pavlas very windy? Anything disturbing the baro hole? Otherwise try cleaning the baro sensor, leave the watch in lukewarm water for a while (I do a couple hours, moving the watch few times), then clean with a very soft toothbrush under running water.

[Pavlas]

I have noticed that this applies to almost all slow and short activities such as walking and running. Cycling is clean. Actually, it’s not that hairy. The graph is zoom. So maybe it’s normal? But I’ll try to clean them as you advise. Thank you!

[Pavlas]

I noticed one other thing. The last run has “hairy” all the data (right picture). The only difference is that I used a heart belt.
The clean run was without the heart belt (left picture).
But most of the shorter and slower activities have that “hairy” elevation profile as I wrote (in Suunto App). The Quantified Self showed it cleanly every time. The last 2 runs are “hairy” in Quantified Self as well.

[Pavlas]

Hmmm. I found a 2018 record from an old watch (Spartan Ultra). It is the same route. And it’s just as “hairy”.
Maybe we have regular solar flares in this area?
It’s very flat terrain. The elevation gain is only 10m (according to the maps). The watch shows more, of course.