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    Problème cumul dénivelé positif sur une course

    Scheduled Pinned Locked Moved Suunto 9
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    • P Offline
      PatBess
      last edited by

      Bonsoir à tous,
      Vendredi j’ai couru l’Endurance trail des Templiers à Millau, 105,6 km et 5300 m de D+ selon l’organisateur et la trace sur Trace de Trail. A l’arrivée, ma Suunto 9 Baro me donne 109,6 km et 4287 m de D+ !
      Normal pour la différence de distance, c’est classique avec toutes les montres à cause des ravitaillements. A chaque ravito je constatais la différence et je gérais la suite en fonction… Mais comment expliquer cet écart de 1000 m de D+ ? C’est énorme ! On ne parle pas de quelques dizaines de mètres, ce qui peut se concevoir, mais là 1000 m ça devient embêtant, y compris pour savoir ça qu’il reste à courir en D+ !
      Je précise que j’avais synchronisé ma montre le matin avant de partir, donc normalement AGPS à jour.
      Quelqu’un aurait une explication ?

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      • M Offline
        Mi_chael Bronze Member
        last edited by

        Essaye en anglais tu auras plus de réponses…

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        • M Offline
          Mi_chael Bronze Member
          last edited by

          Quelle montre as tu?

          P 1 Reply Last reply Reply Quote 0
          • P Offline
            PatBess @Mi_chael
            last edited by

            @Mi_chael S9 Baro

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            • M Offline
              Mi_chael Bronze Member
              last edited by

              Tu l’as porte au poignet droit ou gauche?
              Avais tu une veste? Était elle en dessous ou au dessus.

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              • P Offline
                PatBess @Mi_chael
                last edited by

                @Mi_chael Poignet gauche et non, pas de veste au dessus, mais ma manchette descendue contre des fois… Ce serait l’explication ?

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                • M Offline
                  Mi_chael Bronze Member
                  last edited by

                  J’ai déjà rencontré des erreurs de dénivelé lorsque les trous du capteur barométrique sont obstrués par intermittences. Pluie, sueur, vêtement…

                  Est-ce que ton altitude de départ ainsi que ton altitude Max correspondent à la réalité?

                  P freeheelerF 2 Replies Last reply Reply Quote 0
                  • P Offline
                    PatBess @Mi_chael
                    last edited by

                    @Mi_chael Ça je n’ai pas vérifié. Je vais regarder.

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                    • freeheelerF Offline
                      freeheeler @Mi_chael
                      last edited by

                      @Mi_chael
                      did you notice that with s9b, too?
                      I only observed this with suunto core.
                      isn’t fusedalti filtering or correcting it?

                      living sideways

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                      • P Offline
                        PatBess @freeheeler
                        last edited by

                        @TELE-HO How can I know about fusedalti ?

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                        • M Offline
                          Mi_chael Bronze Member
                          last edited by

                          Fusedalti corrige l’altitude dans les 10min environ après le début d’un Moves.
                          Néanmoins il te faut une bonne couverture gps.
                          Il me semble que ça te créer un décrochage sur la courbe de vitesse verticale lors de l’ajustement.

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

                            @Mi_chael
                            I’m so glad we have Google translate 😉
                            it would be helpful to see the alti graph… if this run is mostly flat the difference between the watch and the “correct” total ascent could be because of the famouse 3meters “issue”

                            living sideways

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                            • ? Offline
                              A Former User @freeheeler
                              last edited by A Former User

                              @TELE-HO said in Problème cumul dénivelé positif sur une course:

                              if this run is mostly flat the difference between the watch and the “correct” total ascent could be because of the famouse 3meters “issue”

                              How can it be mostly flat if the gain is more than 5 km in in 100 km? That means the average grade is about 10% (assuming a similar amount of elevation loss).

                              And yes, even if all the climbs and descents are larger than 3 meters, Suunto 9 still counts less ascent than actual. I posted about this issue in details in the past.

                              freeheelerF P 2 Replies Last reply Reply Quote 1
                              • freeheelerF Offline
                                freeheeler @Guest
                                last edited by

                                @silentvoyager
                                sorry, I did not want to say most of the trail is flat… I imagined if a long enough distance is small ups and downs, not entire trail.
                                you’re right, we’ve had this topic couple of times.
                                I understand that finding the answers is not easy even with a good search function

                                living sideways

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                                • P Offline
                                  PatBess @Guest
                                  last edited by

                                  @silentvoyager You’re right, it wasn’t flat !!
                                  So it’s a problem with the watch ? A difference of 1000 meters is a big problem on that race !!

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

                                    @PatBess
                                    did you compare your alti graph with the original already?
                                    I just looked it up and saw that your screenshots are similar to the original graph (don’t get me wrong, for sure it’s not flat) but it might be something in the detail…
                                    the original graph shows tonns of small spikes

                                    living sideways

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                                    • freeheelerF Offline
                                      freeheeler
                                      last edited by

                                      spikes example…
                                      I’m interested in that because I went on the same trail last week with 2 different total ascent results
                                      Screenshot_20191020-233421.png

                                      living sideways

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                                      • P Offline
                                        PatBess @freeheeler
                                        last edited by

                                        @TELE-HO Yes there was a lot of small spikes ! I don’t know how to have more details with the file my S9Baro recorded…
                                        Maybe the software of the watch is sort of “flattening” the smaller pikes, which could explain the elevation difference ?

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

                                          @PatBess
                                          that’s what I also like to know…
                                          first pic is with total ascent of 240m.
                                          second pic is with total ascent of 286m. exactly the same trail but the 2nd day with some “noise” in the recording. I assume day 1 was right and day 2 with the noises, something went wrong. it your case it must be vice versa…

                                          Screenshot_20191020-235412.png Screenshot_20191020-235445.png

                                          living sideways

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                                          • 7 Offline
                                            77alex77 Bronze Member
                                            last edited by

                                            Hello,

                                            I ran the Marathon des Causses, Festival des templiers, Millau on Saturday : 37 km and 1780m ascent. My S9 baro recorded 36.5 km and 1658m ascent, an error about of 100m. I syncronized AGPS the morning before the race. One day before I recalibrated the compass and requested an automatique adjustment for altitude.

                                            (Félicitations PatBess pour ta course)

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