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Forerunner 955 Solar - GPS Distance Issues

I have had numerous issues with my Garmin Forerunner 955 Solar since it was purchased just over a year ago. Frustratingly, it always seems to over record distance on my running workouts and it has literally never been right or below what you'd expect.

I get the worst results at the track when it usually records each 400m inside lane lap as around 430m. Looking at the GPS map of my workout, it looks like I am running in every lane of the track which I wasn't. 5km races are always 5.07km - 5.12km.

I have tried all resolution options including trying all the GPS options, Every Second, 3D, Auto-Pause, Soaking for ages before every run etc. and it's never made a difference. I have been in touch with Garmin and had my watch replaced once and they have since offered to refund it after my latest issues.

Does anyone know why I have had issues with both watches? As an FYI, I live in outer London in Tooting. Whilst it's densely populated, there are no high rise buildings around me and not a lot of woodland.

If I upgraded to a Fenix or Epix, would I have the same issues? I used the Forerunner 920XT for the best part of a decade and whilst it was rarely bang on, it was consistently either right or slightly under or slightly over. It's really hard to do a hard workout if you know your watch is always going to be over the distance (without being sure by how much).

0 Stefan over 1 year ago

I have no idea what can be expected from a watch with a accordingly small GNSS antenna but 2,5% accuracy seems not bad to me.

The only astonishing thing is it should be normal distributed so if you do the same track sometimes more and sometimes less distance.

Do you have stops in you runs? So for example traffic lights? Thats I think what is annoying, that is also sums up the distance while standing and there are always some meters between the gps fixes in resting position... and the watch would know exactly that there is no moovement...