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Doubt about Suunto 9 Baro altimeter/barometer calibration

Scheduled Pinned Locked Moved Suunto app - Questions & Feedback
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  • J Offline
    johann.fuehrer Bronze Member @freeheeler
    last edited by johann.fuehrer 19 Aug 2019, 12:56

    @TELE-HO Is it possible for you to merge this one and the recorded one in to one graph? Maybe quantified.io is helpful? I did nor use it yet, but have seen a lot of such stuff is done in there by others…

    D 1 Reply Last reply 19 Aug 2019, 13:01 Reply Quote 0
    • D Offline
      Dimitrios Kanellopoulos Community Manager @johann.fuehrer
      last edited by 19 Aug 2019, 13:01

      @johann-fuehrer Jup that is possible

      Community Manager / Admin @Suunto
      Creator of Quantified-Self.io
      youtube.com/c/dimitrioskanellopoulos
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      • F Offline
        freeheeler @mario_b
        last edited by 19 Aug 2019, 13:05

        @mario_b
        yes I am aware that you switch off fused alti when manual calibrating during an activity recording.
        Here’s the sea level pressure with the altitude profile.

        @Dimitrios-Kanellopoulos
        I don’t know who to do an overlay… but if I do an overlay, it would be necessary to have it almost idential from the drawn to the recorded track to have the best comparison, right?

        6414a92e-187c-478b-9d3c-00e2324642f5-image.png

        living sideways

        D J M 3 Replies Last reply 19 Aug 2019, 13:06 Reply Quote 0
        • D Offline
          Dimitrios Kanellopoulos Community Manager @freeheeler
          last edited by 19 Aug 2019, 13:06

          @TELE-HO update 2 activiteis / routes to QS.
          Select them on the table
          Press merge
          Use the distance axis when viewing

          Community Manager / Admin @Suunto
          Creator of Quantified-Self.io
          youtube.com/c/dimitrioskanellopoulos
          https://instagram.com/dimitrioskanellopoulos
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          • J Offline
            johann.fuehrer Bronze Member @freeheeler
            last edited by 19 Aug 2019, 13:07

            @TELE-HO for a GPX track you can get “real” altitude information here i.e. https://www.gpsvisualizer.com/elevation but I do not know how exact that is…

            J 1 Reply Last reply 19 Aug 2019, 13:08 Reply Quote 0
            • J Offline
              johann.fuehrer Bronze Member @johann.fuehrer
              last edited by 19 Aug 2019, 13:08

              @johann-fuehrer … it’s a 30m x 30m grid SRTM1

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              • D Offline
                Dimitrios Kanellopoulos Community Manager
                last edited by 19 Aug 2019, 13:14

                Runanalyze!

                Screenshot 2019-08-19 at 15.13.47.png

                Community Manager / Admin @Suunto
                Creator of Quantified-Self.io
                youtube.com/c/dimitrioskanellopoulos
                https://instagram.com/dimitrioskanellopoulos
                https://www.strava.com/athletes/7586105

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                • M Offline
                  mario_b @freeheeler
                  last edited by 19 Aug 2019, 13:14

                  @TELE-HO perfect. i think you’ve being right, as you said, that i could be, because you calibrated it on the gondola.
                  as you can see, fused-alti is correcting the altitude all the time on the activity to a higher altitude. is the altitude value on the end of the activity nearly correct?

                  F 1 Reply Last reply 19 Aug 2019, 13:17 Reply Quote 0
                  • F Offline
                    freeheeler @mario_b
                    last edited by 19 Aug 2019, 13:17

                    @mario_b
                    yes, it is absolutely correct at the end.

                    I just noticed that I’ve had a GPS precision issue for the first 35minutes of this activity anyway. I wanted to redraw the exact route but saw that the signal was off track at the beginning… it does not make sense to overlay my recorded move with a drawn route I think.

                    c02a811e-6f7e-4a16-9ca7-9966aefad5ea-image.png

                    living sideways

                    M 1 Reply Last reply 19 Aug 2019, 13:28 Reply Quote 0
                    • M Offline
                      mario_b @freeheeler
                      last edited by 19 Aug 2019, 13:28

                      @TELE-HO so i would say, there is nothing wrong with your watch. looking at the ambient pressure at around 930 (which is not anough for the swiss the last weekend) i think it was only a faulty calibration at start. then fused alti kicked in, and corrected the altitude until it was nearly correct. (>1005 hpa at the end sound more possible too). 🙂 👍

                      J 1 Reply Last reply 19 Aug 2019, 14:37 Reply Quote 1
                      • J Offline
                        johann.fuehrer Bronze Member @mario_b
                        last edited by johann.fuehrer 19 Aug 2019, 14:37

                        @mario_b same opinion. Somewhere at 1 h 15 mins after start it started to look ok.

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                        • ? Offline
                          A Former User @Dimitrios Kanellopoulos
                          last edited by 19 Aug 2019, 14:37

                          @Dimitrios-Kanellopoulos Thanks 👍 . Again, sounds logic.
                          After my test that I described below I have this doubt: you know with which frequency the S9B take samples of the barometer to calculate and show the altitude? or which is the frequency that update the altitude displayed?

                          I made a simple test using the S9B, Mobile with barometer and Samsung Gear Frontier. I went downstairs one floor (~4m difference).

                          1st try: S9B not show differences even after ~20sec or a bit more. Mobile and Gear displays the -4m variation instantly, the altitude on these both devices is continuing updating almost on each step that I do down.
                          I went up. Mobile and Gear displays the variation of +4m. S9B again no differences. After around 5 minutes, I see that the S9B display me a -4m difference (wrong), looks like displays me the value from when I was down, but do not register that I went up again.

                          2nd try: Mobile & Gear again displays correct results instantly and continuously. S9B: I decide give more time waiting on each floor. After few seconds or minute waiting on the lower floor, start to display me a variation of -3m, after few minutes I get the -4m. I went up again, +4m after few seconds or almost a minute.

                          Results: Mobile & Gear displayed correct value all the times and instantly. S9B worked tricky. One time showed me a correct result but maintained the difference error created on 1st try. 2nd try was perfect, but need sometime to show me the correct values.

                          J M 2 Replies Last reply 19 Aug 2019, 14:40 Reply Quote 0
                          • J Offline
                            johann.fuehrer Bronze Member @Guest
                            last edited by 19 Aug 2019, 14:40

                            @flypg I have read about some threshold value which must be reached until an altitude change is recognized by the watch, I think it was about 3m or somewhere in that range. Maybe this kicks in as well …

                            ? 1 Reply Last reply 19 Aug 2019, 14:48 Reply Quote 0
                            • ? Offline
                              A Former User @johann.fuehrer
                              last edited by 19 Aug 2019, 14:48

                              @johann-fuehrer Thanks, yes, this is why I would like know with precision to understand a bit more the watch. I think that also exist some timelapse to process this or display this and this results in the “delay” that I see to display the information.

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                              • M Offline
                                mario_b @Guest
                                last edited by 19 Aug 2019, 14:56

                                @flypg if it’s the same algorythm that is used in the ambit3 peak for automatic mode then:
                                When in watch mode, it messures every 10 sec. if you move up/down more then 5 meters in elevation (around 0,6hpa) in 3 minutes, it switches to alti-mode. when your are moving less then 5 meters in 12 minutes the watch switches back to baro-mode

                                ? 1 Reply Last reply 19 Aug 2019, 15:11 Reply Quote 1
                                • ? Offline
                                  A Former User @mario_b
                                  last edited by A Former User 19 Aug 2019, 15:11

                                  Thanks @mario_b! Now I can understand for what on 1st try the reaction not was immediately and I got better results on 2nd try.

                                  it messures every 10 sec

                                  Wow, I imagined that should be a lower value, by this I expected a faster response in the update of the altitude readings. But really not need a faster update in watch mode, because for this I have the Sport Modes.
                                  Thanks to everyone again!

                                  D 1 Reply Last reply 19 Aug 2019, 15:12 Reply Quote 1
                                  • D Offline
                                    Dimitrios Kanellopoulos Community Manager @Guest
                                    last edited by 19 Aug 2019, 15:12

                                    @flypg it counts higher than 3-5m variations in 12 minutes. If you would go a bit more low then both devices should react the same.

                                    That is to wipe out pressure changes as we talked before

                                    Community Manager / Admin @Suunto
                                    Creator of Quantified-Self.io
                                    youtube.com/c/dimitrioskanellopoulos
                                    https://instagram.com/dimitrioskanellopoulos
                                    https://www.strava.com/athletes/7586105

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                                    • D Offline
                                      Dimitrios Kanellopoulos Community Manager
                                      last edited by 19 Aug 2019, 15:13

                                      https://www.suunto.com/en-gb/Support/Product-support/suunto_9/suunto_9/valid-for-barometer-version-only/outdoor-insight/

                                      If you are at a constant altitude (less than 5 meters of vertical movement within 12 minutes), your watch interprets air pressure changes as weather changes and adjusts the barometer graph accordingly.

                                      Community Manager / Admin @Suunto
                                      Creator of Quantified-Self.io
                                      youtube.com/c/dimitrioskanellopoulos
                                      https://instagram.com/dimitrioskanellopoulos
                                      https://www.strava.com/athletes/7586105

                                      J 1 Reply Last reply 19 Aug 2019, 15:28 Reply Quote 1
                                      • ? Offline
                                        A Former User
                                        last edited by 19 Aug 2019, 15:25

                                        Thanks again to everyone!

                                        Yes @Dimitrios-Kanellopoulos, this explains that on all my attempts I generated a altitude variation > 30m in less than 12 minutes (because I went up and down several times more than the 2 tests).
                                        The only that is not totally clear is the variation of 1st try that the S9B not registered this +4 of when I went up.

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                                        • J Offline
                                          johann.fuehrer Bronze Member @Dimitrios Kanellopoulos
                                          last edited by 19 Aug 2019, 15:28

                                          @Dimitrios-Kanellopoulos I have a Spartan Ultra: I’m sitting at the moment in my office at 214m above sea level. I know from the weather station on my altitude just some 2km away, that we have 2015.4 hPa at 30 C temperature. My watch shows me 2021 hPa. If I like to have a correct pressure reading, I would have to change the altitude to 165m. SO how can I bring this together to see correct altitude AND correct pressure?

                                          D 1 Reply Last reply 19 Aug 2019, 15:34 Reply Quote 0
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