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GPS Drift by 200m

My Garmin Forerunner 735XT GPS has suddenly started drifting when I've been running.

I run around the local park, same start and end point so I know where the 5km and 10km points are on my runs.

The past few weeks I've needed to run further and further to reach 10km. The point at which 10km used to be is now 9.8km so I'm running an extra 200m.

It started off being a 10/20m out and now it's 200m so it's getting worse with each run.

Does anybody know what is causing this or how I can fix it?

Cheers

0 Andy275 over 4 years ago

Might it be related to this?

www.dcrainmaker.com/.../tech-tidbits-garmin-gps-offsets-again-and-powertap-units-discontinued.html

0 MorganJones33 over 4 years ago in reply to Andy275

Hi Andy

The routes on Strava are still in line with the path that i've been running on though.

Here is a run from 24th Jan:

And one from today:

Both are 10km but as you can see the finishing point is different.

0 Andy275 over 4 years ago in reply to MorganJones33

Hi Morgan, Mine (with firmware 9.80) shows me running off road for periods (but not offset like in the article) which could lead to small additive errors over 10k (I rarely run that far). I also noticed that even though it says GPS acquired, my map sometimes starts shortly after my actual start. 200m for you is 2%, which isn't huge but it still should be better. Try doing a GPS soak for a few minutes before running (you can start a run activity and then delete it before starting you actual run). That may acquire more than the minimum number of satellites. Also make sure you sync the watch with Garmin Connect regularly. Good luck!