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Garmin Forerunner 255 – GPS Issues

DoDo
4 months ago

Hi everyone,

I’ve been having trouble with my Forerunner 255’s GPS for the past week. It suddenly stopped finding satellites when starting outdoor activities like running or walking. Until then, it worked perfectly.

I tried restarting the watch, syncing with Garmin Express and Garmin Connect to refresh satellite data. Oddly enough, it worked yesterday and I completed a run. But later in the day, it failed again.

During today’s workout the signal even dropped mid‑activity and hasn’t come back since. Sob

Now, it just keeps searching without locking onto GPS – even after 30 minutes under clear sky. It’s very unreliable and I can’t figure out any pattern. I’ve tried everything except a factory reset.

Anyone else had similar issues? I'm on software version 23.20. Would really appreciate any suggestions!

  • 0 2 days ago in reply to chocorello

    You can check the status of the "ephemeris" in the System -> About menu.  It is one of the later screens in the loop, so I go through the list backwards with the UP button.

    My FR255 will show "missing" after about 1 week, and goes back to "current" after I let it sync with the phone app for about 10-15 minutes. When I am charging it once ever 2 weeks, I sync when charging and a second time in between.

    I also think that the GPS does better when I am using it daily, and takes a bit longer if I skip a day, even when it shows "current".

  • 0 2 days ago in reply to 6125703

    I mostly sync by wifi (FR255 Music), and that seems to keep the ephemeris up to date.