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    Altiude measurement issues

    Scheduled Pinned Locked Moved Suunto 9 Peak
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    • isaziI Offline
      isazi Moderator @guenthi
      last edited by

      @guenthi if you manually calibrated altitude before the start, you disabled FusedAlti.
      FusedAlti uses GPS to calibrate altitude automatically during the activity, if the baro altitude is very different from GPS altitude (and GPS vertical error is low).

      Watch: Suunto Vertical Ti

      Blog: isazi's home

      guenthiG 1 Reply Last reply Reply Quote 0
      • guenthiG Offline
        guenthi @isazi
        last edited by

        @isazi Thanks for the quick reply - so what does that mean in my case, I calibrated before starting an acticvity, but GPS is used during the activity for recording the track, but height is no more adjusted then with FusedAlti?
        This seems strange to me… can you explain this a bit more, or do you know where I can find more information about how the Peak 9 behaves for altitude measurement?
        Thank you!

        isaziI Brad_OlwinB 2 Replies Last reply Reply Quote 0
        • isaziI Offline
          isazi Moderator @guenthi
          last edited by

          @guenthi said in Altiude measurement issues:

          @isazi Thanks for the quick reply - so what does that mean in my case, I calibrated before starting an acticvity, but GPS is used during the activity for recording the track, but height is no more adjusted then with FusedAlti?

          Exactly what you say. I never manually calibrate my watch, and just rely on FusedAlti to do it during the activity, because it works really well. If you manually calibrate you disable FusedAlti (not sure for how long though).

          Hope you had a good time in Ötztal, haven’t been there in few years.

          Watch: Suunto Vertical Ti

          Blog: isazi's home

          1 Reply Last reply Reply Quote 3
          • Brad_OlwinB Offline
            Brad_Olwin Moderator @guenthi
            last edited by

            @guenthi what @isazi says. I do not manually calibrate either. I am in the mountains every weekend, my altitude data are usually quite accurate.

            Vector/T6c/Ambit 3 Peak/S5 Copper/S3/S7 Ti/S9 baro Ti/S9P Ti/S9PP Ti/Vertical Ti/Race Ti/RaceS/Ocean/Wing

            thanasisT 1 Reply Last reply Reply Quote 1
            • thanasisT Offline
              thanasis Bronze Member @Brad_Olwin
              last edited by thanasis

              @Brad_Olwin i am curious why would prefer gps adjusted altitude rather than just barometric adjustment if you can calibrate the altimeter based on certified height for instance .

              Based on similar posts here in the forum I was using the automatic calibration and In several occasions where I was by the sea, I tended to get -11 or -8 m readings. On the contrary by setting the actual altitude I was very spot on on my other readings .
              So I miss something here ?

              freeheelerF 1 Reply Last reply Reply Quote 0
              • freeheelerF Offline
                freeheeler @thanasis
                last edited by

                @thanasis
                yes maybe… it could be that the idea behind FusedAlti is that you can focus on your sport without playing around with setting the altitude frequently during long activities with stormy, changing weathers?
                11m wrong looks like a lot when you’re standing at the sea. when you are in the mountains at 3’000m, being 11m wrong is not so critical… I know some people would disagree here…

                living sideways

                DMytroD 1 Reply Last reply Reply Quote 2
                • DMytroD Offline
                  DMytro @freeheeler
                  last edited by

                  @freeheeler funny story, a year ago I was climbing my first 3k mountain, at the top the watch has shown just 2998m which was a putty XD.

                  freeheelerF 1 Reply Last reply Reply Quote 2
                  • freeheelerF Offline
                    freeheeler @DMytro
                    last edited by

                    @DMytro
                    I observe very precise measurements very often, too.
                    but some meters off is within tolerance IMO.
                    also when we take into account how complex this feature is

                    living sideways

                    DMytroD 1 Reply Last reply Reply Quote 2
                    • DMytroD Offline
                      DMytro @freeheeler
                      last edited by

                      @freeheeler not saying otherwise, just a pity that the watch didn’t justify 3k XD.

                      freeheelerF 1 Reply Last reply Reply Quote 0
                      • freeheelerF Offline
                        freeheeler @DMytro
                        last edited by

                        @DMytro
                        aah 🙈 …next time, climb the summit cross 😜

                        living sideways

                        1 Reply Last reply Reply Quote 1
                        • Panagiotis KritikakosP Offline
                          Panagiotis Kritikakos Gold Members
                          last edited by

                          There is good explanation with examples on the following link regarding pressure and GPS altitude readings: https://xcmag.com/news/gps-versus-barometric-altitude-the-definitive-answer/

                          I have also experienced negative values on sea level, both when getting to sea level from higher altitude as well as when trying FusedAlti for auto-adjustement. During activities on mountains I can’t recall having any (major) issues with readings as they were mostly accurate.

                          I think S9P misses the ability to get manual pressure set as it existed in A3P for instance.

                          Suunto Vertical | 9 Peak | Ambit 3 Peak | 3 | Gekko
                          Garmin eTrex 30x

                          freeheelerF 1 Reply Last reply Reply Quote 1
                          • freeheelerF Offline
                            freeheeler @Panagiotis Kritikakos
                            last edited by freeheeler

                            @Panagiotis-Kritikakos
                            edit: sorry, you asked for pressure, I already answered it is possible but that’s only true for altitude… yes, setting the pressure is not possible, but also not really necessary as only relative pressure matters IMO

                            living sideways

                            Panagiotis KritikakosP 1 Reply Last reply Reply Quote 0
                            • Panagiotis KritikakosP Offline
                              Panagiotis Kritikakos Gold Members @freeheeler
                              last edited by

                              @freeheeler I also mean relative pressure, not absolute. For example, today I noticed difference by what the watch was reading and what the nearest weather station was reporting ~1.5km away in direct line and same sea level. Not sure if pressure can be sligtly different in such short distance with same conditions. I suppose other factors can affect the watch and I pressume the station is reporting correctly.

                              Suunto Vertical | 9 Peak | Ambit 3 Peak | 3 | Gekko
                              Garmin eTrex 30x

                              freeheelerF 1 Reply Last reply Reply Quote 0
                              • freeheelerF Offline
                                freeheeler @Panagiotis Kritikakos
                                last edited by

                                @Panagiotis-Kritikakos
                                that’s what I mean… doesn’t matter if the station shows different than your watch. what matters is, that if the station drops e.g. by 3 hPa over night, that your watch (if close enough to the station) drops 3 hPa, too

                                living sideways

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