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Problem with the GPS on Forerunner 955

9806804
over 1 year ago

Hello everyone, there was a problem with the GPS on the Garmin Forerunner 955. When I came on vacation to Batumi (Georgia), the GPS reception was poor. I have done several runs and always have the same problem, the first 10 minutes the pace jumps a lot, then it returns to normal. This happened for 4 training sessions. I tried different satellite settings, even did a factory reset, but nothing helped. When I ran with the other guys, everything was fine with them. Please tell me what could be the problem. I am attaching screenshots from the training sessions.

  • 0 over 1 year ago

    It's known that the Black Sea area has seen some GPS jamming over the past year, and your tracks suggest there was interference when you were on the northwest facing coast (sea side zone), with a good track when you were sheltered by the headland near the harbour.

  • 0 over 1 year ago

    Do you use HRM-Pro? What about Satelite \ Recording options? 

    Have you had normal tracking before? It looks like u have problem as mine. GPS crashes at first 4-6 minuts and than it's ok.

    By the way, Do you have the same problem with other activities (outdoor cycling or walk, or other one which useing GPS)? 

  • 0 over 1 year ago in reply to UltraKapitan

    Yes, I use HRM-Pro. I tried different options Satellite\Recording and there was a problem everywhere.

    Yes, there was normal tracking before. Yes, the same GPS glitches for the first few minutes, and then everything is ok.

    I used hiking and everything was ok, but the location was a little different. I'm returning home from vacation in a few days and will see if the problem happens again.

    Also, I noticed when I turn on the workout, wait for the GPS signal, it lights up green, and then red, then after a while it turns green and red, and so it jumps back and forth.

  • 0 over 1 year ago in reply to 9806804
    9806804 said:
    Also, I noticed when I turn on the workout, wait for the GPS signal, it lights up green, and then red, then after a while it turns green and red, and so it jumps back and forth

    I know others have downvoted me for saying this, but this sounds very much like external interference.