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speed en kms wrong on Vivoactive 4S

I have had a Garmin Vivoactive 4S since 07/2020. I run a lot in the woods, but since January my speed and therefore kilometers are no longer correct when I run under trees. At the smallest tree my speed remains fixed at, for example, 9.2 km / h.
If I compare his mileage with my running friend, it quickly saves 500m on a 10km run. The time per kilometer is no longer correct for me. I have no problem with a road run. I got a new one from Garmin under warranty, but the same problem occurs here.
I have already changed GPS separately and + glasnoss and + Galileo, but this does not help.
What could this have to do with? I haven't had this in more than half a year. Then it worked perfectly.

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  • I have had a Garmin Vivoactive 4S since 07/2020. I run a lot in the woods, but since January my speed and therefore kilometers are no longer correct when I run under trees. At the smallest tree my speed remains fixed at, for example, 9.2 km / h.
    If I compare his mileage with my running friend, it quickly saves 500m on a 10km run. The time per kilometer is no longer correct for me. I have no problem with a road run. I got a new one from Garmin under warranty, but the same problem occurs here.
    I have already changed GPS separately and + glasnoss and + Galileo, but this does not help.
    What could this have to do with? I haven't had this in more than half a year. Then it worked perfectly.

    Hello! Would you be able to share a couple activities (possibly of the same course/path) with one when the watch recorded it correct and one when it did not?

  • Voor ex. up mij friend, second me.  run under trees

    This one is ok because run on the road:

      

  • Tomorrow or in the weekend, i'll check with only gps and not gps+glonass or galileo