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Here we go again: altimeter is wrong on fast ascent

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  • Here we go again: altimeter is wrong on fast ascent

    Here we go again! Today while i'm coming at home from the sea, i tried for the first time navigation and voilà: altimeter was totally wrong! When i was near my home that is about 110m asl, altimeter reported 75m! I tried to calibrate it but when i set correct altitude, it started to count slowly to calibrated altitude like my Fenix 5X did; altimeter was set on continous calibration. More info here: https://forums.garmin.com/forum/on-t...on-fast-decent ! I can't believe it! Luckily this time i bought it on Amazon, so if things don't change quickly, i'll return it and i'll stay with my Spartan Ultra that never had this bug!

  • #2
    I tried also today a "track me" activity from my home (110m) to the sea (0 m) and when i'm arrived altimeter was still at 40m and still counting 40, 39, 38 ecc... i tried with barometer set to "altimeter mode", "auto mode" and i tried also to turn off continuous calibration of altimeter but the result is the same!

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    • #3
      I had this issue on my new 5 Plus, but only when I wear the watch on my left wrist, where the altimeter port is facing straight in the the passing air. Putting the watch on my right wrist or mounting it to the handle bars of my bike solved the problem.

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      • #4
        I experienced this issue also if I driving my car if there is a quick elevation change. Also if I try to calibrate altimeter after a swim, it doesn't calibrate but altimeter starts to count until set altitude...I think it's the same problem reported here:


        https://forums.garmin.com/forum/into...-slow-to-react



        https://forums.garmin.com/forum/on-t...9-20-from-8-00


        https://forums.garmin.com/forum/on-t...cling-activity


        https://forums.garmin.com/forum/on-t...tion-units-bug


        https://forums.garmin.com/forum/on-t...ng-an-activity


        https://forums.garmin.com/forum/on-t...ing-and-flying

        To me, make my altitude profile(and the watch) totally useless! I have reported this bug many times to beta team but nothing... I reported this bug also yesterday for confirm them that bug is still here also in latest beta, no answer.

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        • #5
          renton82 When you say "driving your car" I worry about that. Is the watch set to auto mode? I can see the watch getting confused while driving. Try locking in Altimeter mode and see what happens.

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          • #6
            Could it be that a drop of sweat is covering the pressure sensor hole and thus it is reacting delayed?

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            • #7
              Originally posted by nmyeti View Post
              renton82 When you say "driving your car" I worry about that. Is the watch set to auto mode? I can see the watch getting confused while driving. Try locking in Altimeter mode and see what happens.
              Just done all possible test : during activity with barometer set to altimeter mode, continuous calibration on or off; barometer set to auto and continuous calibration set on or off; watch in widget mode without start any activities and barometer set to altimeter or auto, no difference, altimeter goes totally wrong on when there is fast ascent/descent.

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              • #8
                Originally posted by Forerunner View Post
                Could it be that a drop of sweat is covering the pressure sensor hole and thus it is reacting delayed?
                Usually I don't sweat when I drive a car or a motorbike...

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                • #9
                  renton82 How fast is "fast?" A recent trail run with 5x seemed to do fine. I'll see what the 5x+ does this week as I'll be descending pretty quickly from 14,000 feet

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                  • #10
                    Are you looking at the widget or the activity after you’ve stopped? Cause I’ve always have had a delay with the widget telling me my current alt. I just chalk that up to the watch needing time to read then graph the current alt. Are you expecting the widget to be real time?

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                    • #11
                      Originally posted by nmyeti View Post
                      renton82 How fast is "fast?" A recent trail run with 5x seemed to do fine. I'll see what the 5x+ does this week as I'll be descending pretty quickly from 14,000 feet
                      Are you sure that this data is correct? Have you try elevation correction? It's strange cause you would be the only one with post 6.xx fw that Fenix 5 X works fine; have you ever look here : https://forums.garmin.com/forum/on-t...9-20-from-8-00 ?

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                      • #12
                        Originally posted by Tommylee84 View Post
                        Are you looking at the widget or the activity after you’ve stopped? Cause I’ve always have had a delay with the widget telling me my current alt. I just chalk that up to the watch needing time to read then graph the current alt. Are you expecting the widget to be real time?
                        I tried both , widget and altitude from activity.

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                        • #13
                          Originally posted by renton82 View Post

                          Are you sure that this data is correct? Have you try elevation correction? It's strange cause you would be the only one with post 6.xx fw that Fenix 5 X works fine; have you ever look here : https://forums.garmin.com/forum/on-t...9-20-from-8-00 ?
                          That run starts and stops at roughly the same altitude. The graph shows that. So i'm asking "what is fast?"

                          Are we talking motorcycle? Mountain Bike? Road bike? Airplane?

                          I'm just pointing out that it *seems* to work for my use. I doubt I'm the only one. I'm just trying to understand your use when you say "it doesn't work"

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                          • #14
                            Motorcycle : Aprilia RS 250, car : Fiat Panda, sky : Atomic Sport Carve, nothing exceptional
                            Last edited by renton82; 07-23-2018, 09:37 AM.

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                            • #15
                              Originally posted by nmyeti View Post

                              I doubt I'm the only one. I'm just trying to understand your use when you say "it doesn't work"
                              However, from this thread : https://forums.garmin.com/forum/on-t...9-20-from-8-00 and from my experience, I think you are a a lucky one because almost all users are talking about this issue.

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