Been running measured routes/race routes with known distance. I take both my phone and watch along. The phone is usually pretty spot on, and variability is low over the same route. The watch though is totally rubbish, and has gotten to a new low. I'm following a running plan with one of the Garmin coaches, and I likely won't be able to finish it in the given time because of this. Some pace comparisons below between phone and watch, same route
date - Phone - Watch -> difference
21/5 - 7:54 - 8:05 -> 0:11
22/5 - 7:38 - 7:49 -> 0:11
25/5 - 7:28 - 7:42 -> 0:14
28/5 - 7:23 - 7:40 -> 0:17
02/6 - 7:28 - 7:41 -> 0:13
05/6 - 7:05 - 7:29 -> 0:24
08/6 - 7:17 - 7:38 -> 0:21
11/6 - 7:13 - 7:43 -> 0:30 This should have been a new record on the watch, but look at the difference!!!
Basically, this is unacceptably bad, and it seems to be getting worse. This is always the same route and distances of 4-5km. I see the same including the worsening for the longer runs, but I use different routes each time and that's less comparable.
What I tried: different GPS sensors anyway. 1s recording is activated of course.Watch on inside of my wrist. Activate the activity when I leave home and walk to my starting point some 500m away, and wait some more there for hopefully better satellite fix. Start area is a big crossing with lots of space. It's inner town running, mostly normal roads with family houses, partially the 'bad part of town' with very wide roads and very few trees and flats very far away from roads. No higher buildings apart from a small stretch of road with 3-4 floors. But the watch is already way off before I get there.
