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    S9 peak GPS accuracy with slow move

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    • V Offline
      vietpq Bronze Member
      last edited by

      My S9 Peak GPS works fine on the road. But when I do trail running in the mountains (slow pace), the GPS seems inaccurate, my watch always has a longer number of kilometers than my companion. Last Sunday, my watch was 36.6km while my 2 friends’ watches were only 34km (they use Garmin 945). This problem always happen to my watch when I go for trail run

      FW: 2.20.30
      GPS system: GPS+QZSS + GLONASS
      The activity link: https://maps.suunto.com/move/vietpham70/62bfeb36e1e180504fcb201e

      Brad_OlwinB 1 Reply Last reply Reply Quote 0
      • Brad_OlwinB Offline
        Brad_Olwin Moderator @vietpq
        last edited by

        @vietpq You are selecting Run, not Trail Run as a sport mode. They are different for GPS and 3D distance. Which is correct? Why do you assume the 945 is 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

        V 1 Reply Last reply Reply Quote 1
        • V Offline
          vietpq Bronze Member @Brad_Olwin
          last edited by

          @brad_olwin I’m sure the 945 is more accurate because the tracklog is much smoother and snap to the road than my S9P

          Brad_OlwinB 1 Reply Last reply Reply Quote 0
          • Brad_OlwinB Offline
            Brad_Olwin Moderator @vietpq
            last edited by Brad_Olwin

            @vietpq said in S9 peak GPS accuracy with slow move:

            @brad_olwin I’m sure the 945 is more accurate because the tracklog is much smoother and snap to the road than my S9P

            That does not imply accuracy. Not so easy to measure and I doubt that smoothing enhances accuracy, likely the opposite. As I stated before, you should select Trail Run not Run for the trail, they are different.

            I have run many slow mountain events with the S9Peak and the Epix2 at the same time (which has much better GPS tracking than the 945 as it has a newer chip) and both agree nearly exactly on distance. This includes two ultra races. I can share data with you if you like.

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

            V 1 Reply Last reply Reply Quote 3
            • A Offline
              ActiveJiggy
              last edited by

              Roads are often in different places than the location shown on maps.

              ? 1 Reply Last reply Reply Quote 0
              • V Offline
                vietpq Bronze Member @Brad_Olwin
                last edited by

                @brad_olwin said in S9 peak GPS accuracy with slow move:

                have run many slow mountain event

                Thank you, next time I will try trail run mode instead of run mode. Do you know exactly what is difference between trail run and run mode?

                Mff73M 1 Reply Last reply Reply Quote 1
                • Mff73M Online
                  Mff73 @vietpq
                  last edited by

                  @vietpq
                  3D distance surely (hopefully ?) πŸ™‚
                  Meaning, if you climb/run a hill, distance is not just horizontal (pure position on map) but with ascent part. In a theorical 45Β° slope, distance really done is around 40% higher than just horizontal (it is a old greek knowledge from Pythagore) πŸ™‚

                  Suunto Spartan Ultra (since 2016) FW: 2.8.24 (retired)
                  Suunto Vertical all black
                  Wife : S9PP
                  SA: Always the latest beta :)
                  Android 13, Galaxy S205G

                  Brad_OlwinB V 2 Replies Last reply Reply Quote 2
                  • Brad_OlwinB Offline
                    Brad_Olwin Moderator @Mff73
                    last edited by

                    @mff73 said in S9 peak GPS accuracy with slow move:

                    @vietpq
                    3D distance surely (hopefully ?) πŸ™‚
                    Meaning, if you climb/run a hill, distance is not just horizontal (pure position on map) but with ascent part. In a theorical 45Β° slope, distance really done is around 40% higher than just horizontal (it is a old greek knowledge from Pythagore) πŸ™‚

                    Well stated!

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

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                    • ? Offline
                      A Former User @ActiveJiggy
                      last edited by

                      @activejiggy said in S9 peak GPS accuracy with slow move:

                      Roads are often in different places than the location shown on maps.

                      you may be affected by this https://www.dcrainmaker.com/2022/07/gps-accuracy-issue-impacted-garmin-suunto-and-polar-watches-over-past-week.html?fbclid=IwAR15NFpgy_4zo-yraZsk2J7elt62G5g9Bc-hOhTS1DksllUo0SlRt50oMZE

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                      • V Offline
                        vietpq Bronze Member @Mff73
                        last edited by vietpq

                        I have contacted to suunto and they said me:

                        β€œ1. When I run with my Suunto 9 Peak does it measure 3D or 2D distance?”
                        Answer: Our watches do calculate 3D distance outdoors based on altitude changes.

                        β€œ2. Is there a difference between trail run mode and run mode about the way the watch records GPS data?”
                        Answer: There is no difference in the GPS signal the watch sends and/or receives the same data

                        @mff73 said in S9 peak GPS accuracy with slow move:

                        @vietpq
                        3D distance surely (hopefully ?) πŸ™‚
                        Meaning, if you climb/run a hill, distance is not just horizontal (pure position on map) but with ascent part. In a theorical 45Β° slope, distance really done is around 40% higher than just horizontal (it is a old greek knowledge from Pythagore) πŸ™‚

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

                          @vietpq Others can comment on this as something may have changed but, my understanding was trail run calculates 3D and running does not. I think hiking was not calculating 3D but believe that has been changed as well.

                          No matter, as I stated before I have 4 months of running mountains with Garmin Epix2 on one arm and a Suunto 9Peak on the other. You cannot tell the difference between them easily nor is there any statistical difference in the distance or elevation data.

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

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