FWIW, with a Series 4 in the last 7 days I’ve ran a marathon that was measured within 100m accuracy, a half marathon that was within 45metres accuracy, a 10k that was within 125m and a 5k that actually beeped the 5km mark as I crossed the line.I started using your app a few months ago cause I was annoyed by the way the native workout app messes around with the GPS track. Most of the time I run with the watch (Series 3) only and keep my phone at home. GPS accuracy is usually just 4 bars. I think it's as precise as it can get on an Apple Watch
But I still noticed that my stats are off compared to my fellow runners. So I started to play around with the settings. Disabled "Intelligent Distances" and "Pace From Pedometer". The stats seem to be more in line now with other recordings for distance and pace.
What I see now is that the pace/distance listed in the app is higher than what is later reported to Apples Activities app. I don't have many data points yet, but it's like up to 100m for every 10k. This might not sound much, but I would consider myself as a dedicated running and so this is rather important for my training.
My assumption is that the stats shown in your app are still with "Intelligent Distances" on. The stats reported to the Activities app are the ones that are comparable with others.
Looking forward to future updates to your app and I hope GPS accuracy gets better with a Series 5 later this year. Otherwise, I may need to buy a dedicated running watch...
Again, your App is great and I think the flaws are on Apple's site. THANKS!
The 10k was in and around MediaCity, so lots of tall buildings and also quite a lot of corners, which probably explains the slight increase in accuracy there...looking at the activity in the phone app I can see accuracy goes worse than 15m quite often when I was running between buildings.
The marathon was at Blackpool, so very open, and also very straight (which both result in good accuracy), I only had to zig zag a bit passing groups of slower runners for the opening 10mins or so, and then it thinned out quite nicely.
I DID run and walk a couple of 30 minute sessions using the standard Workout app a few months ago, no idea if that has helped with calibration etc for the live displayed stats. I do have intelligent distances enabled although I may do some experiments with that on a measured track at some point.