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Altiude measurement issues

Scheduled Pinned Locked Moved Suunto 9 Peak
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  • I Offline
    isazi Moderator @guenthi
    last edited by 28 Aug 2022, 12:36

    @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

    G 1 Reply Last reply 28 Aug 2022, 12:42 Reply Quote 0
    • G Offline
      guenthi @isazi
      last edited by 28 Aug 2022, 12:42

      @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!

      I B 2 Replies Last reply 28 Aug 2022, 12:47 Reply Quote 0
      • I Offline
        isazi Moderator @guenthi
        last edited by 28 Aug 2022, 12:47

        @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
        • B Offline
          Brad_Olwin Moderator @guenthi
          last edited by 29 Aug 2022, 16:42

          @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

          T 1 Reply Last reply 11 Sept 2022, 05:29 Reply Quote 1
          • T Offline
            thanasis Bronze Member @Brad_Olwin
            last edited by thanasis 9 Nov 2022, 05:30 11 Sept 2022, 05:29

            @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 ?

            F 1 Reply Last reply 11 Sept 2022, 07:06 Reply Quote 0
            • F Offline
              freeheeler @thanasis
              last edited by 11 Sept 2022, 07:06

              @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

              D 1 Reply Last reply 11 Sept 2022, 07:53 Reply Quote 2
              • D Offline
                DMytro @freeheeler
                last edited by 11 Sept 2022, 07:53

                @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.

                F 1 Reply Last reply 11 Sept 2022, 07:57 Reply Quote 2
                • F Offline
                  freeheeler @DMytro
                  last edited by 11 Sept 2022, 07:57

                  @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

                  D 1 Reply Last reply 11 Sept 2022, 08:49 Reply Quote 2
                  • D Offline
                    DMytro @freeheeler
                    last edited by 11 Sept 2022, 08:49

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

                    F 1 Reply Last reply 11 Sept 2022, 10:04 Reply Quote 0
                    • F Offline
                      freeheeler @DMytro
                      last edited by 11 Sept 2022, 10:04

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

                      living sideways

                      1 Reply Last reply Reply Quote 1
                      • P Offline
                        Panagiotis Kritikakos Gold Members
                        last edited by 12 Sept 2022, 19:25

                        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

                        F 1 Reply Last reply 12 Sept 2022, 19:36 Reply Quote 1
                        • F Offline
                          freeheeler @Panagiotis Kritikakos
                          last edited by freeheeler 9 Dec 2022, 19:39 12 Sept 2022, 19:36

                          @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

                          P 1 Reply Last reply 12 Sept 2022, 20:10 Reply Quote 0
                          • P Offline
                            Panagiotis Kritikakos Gold Members @freeheeler
                            last edited by 12 Sept 2022, 20:10

                            @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

                            F 1 Reply Last reply 12 Sept 2022, 20:18 Reply Quote 0
                            • F Offline
                              freeheeler @Panagiotis Kritikakos
                              last edited by 12 Sept 2022, 20:18

                              @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

                              1 Reply Last reply Reply Quote 1
                              • F freeheeler referenced this topic on 20 Sept 2022, 05:27
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