Garmin Fenix 6 GPS started working very bad, almost not at all. What to do ?

Did you try to change the GPS signal to GLONASS, Galileo or GPS?

Tried GPS Only, GPS + Glonass, GPS + Galileo.

No improvement.

My 6x is doing exactly the same. Basically useless. Any solution. Doesn't really give me faith in future Garmin products. My old Forerunner 920xt tracks perfectly. I even got my old Edge 800 out which is GPS only and that tracks perfectly

Is the ephemeris (CPE) or current? Can you exclude GPS interference in your area? Did your watch suffer a fall (the antenna or connection can break)? My F6X works perfectly, no GPS issues at all.

Some updates and answers:

• nothing has changed in the past few years:
  • same phone (with same garmin connect app)
  • same area for walks & runs, where everything worked fine until about ~1 week ago (same forrest, same lake, same city edge, no tall buildings appeared in the meantime)
• up to date with software versions
  • CPE is "current"
• watch did not suffer any fall / shock / damage

I had 2 chat discussions with somebody from support, based on all evidence, it seems to be just a defective watch...

I was offered the chance to get a "refurbished" replacement device, but it costs me ~180 EUR (since this current watch that I have is out of warranty).

I'm going to pass this, I'm not willing to give any more money to Garmin, for several reasons:

• my original first watch was broken by the infamous software update from spring of 2022; luckily for me at that time it was still in warranty, so I got a free "refurbished" device as replacement: this device, who's GPS broke now...
• I heard about how Garmin intends to place some of the features behind a paywall; a hard No from me...

I'll just keep using this partially defective one as long as it's still almost usable, then I'll switch to something from a different manufacturer... 

A bit of background

I own 5 gamin devices plus the Fenix 6x which I bought second hand off FB for $400 (235 euro). It's never worked properly since I bought it. Seller denies it was defective, he even sent me screen rips of an activity (no evidence its the Fenix though). All my other Garmin devices have worked great

I've had two support calls with Garmin who have walked me through a few things (delete a folder called Remote SW, then resync with Garmin Express, reset). The watch knows where I am because I can switch to the map (before I start an activity) and it shows my house but when I start an activity it doesn't track me walking down the street

I'm partly upset at Garmin but also upset at the guy who sold it to me. He must of known something was up. Maybe he did take a fall but I've crashed hard on my mountain bike with the Edge 800 and treated my 920xt really rough. 

I've just tried another idea as per another post but I doubt it will change it

The service call I had with Garmin suggested connecting the Fenix to a Windows PC and accessing it as a connected drive. Navigate in Windows Explorer to GRAMIN/RemoteSW and delete the whole RemoteSW folder. Disconnect and sync with Garmin Express. I did all this. Confirmed the RemoteSW had been repleced (by connecting as drive) and it contained a new file. Unfortunately the next activity I completed, a walk, didn't start GPS tracking until about 15mins in but the tracking was really poor, basically a zig zag of 10+ ms when it should of been straight

Sorry for repeating myself in my last two comments. there was a delay in the approval of my first comment. Up until now I've always considered Garmin to be the gold standard of GPS equipment for outdoor activity but this Fenix 6x issues is really bad

those manual interventions in the folder structure of the watch only make sense if you can spot some software "anomalies" (eg. not seeing a correct GPS version, or that CPE thing not set to "current").

but when the problem is the GPS sensor itself which is malfunctioning, there's nothing you can correct from "the software side" ...