Hello mgrant1248,
Thank you for using Apple Support Communities! I understand that when running with your Apple Watch Series 5, your GPS doesn't appear to be as accurate as it was in the past. I would be happy to help take a closer look at what to do next.
Since you mentioned that you've already tried some troubleshooting suggestions that you found, I'd also like to confirm if you've done the following:
Use your Apple Watch without your iPhone nearby - Apple Support
"4. For GPS accuracy when you walk, run, or cycle outdoors, select the appropriate Workout and bring your iPhone. For GPS accuracy, you can also calibrate your Apple Watch. Apple Watch Series 2 and later has built-in GPS that allows you to get more accurate distance and speed information during an outdoor workout without your paired iPhone."
If you've already done that or if there's no change in accuracy after, I'd like to collect a few more details:
- Is this a GPS + Cellular or GPS only Apple Watch?
- Do you bring the companion iPhone while on runs?
- Is your route inaccurate when running in specific locations or through obstacles such as trees or bridges?
Cheers!