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SOLVED with 13.09Beta
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I'm not sure this "feature" was introduced with a recent firmware update but I recently noticed that the running pace took a long time to "catch up" on my V2, say if I start my run at 5'/km it will show 12 than 11, 10, 8, etc...before reaching 5. Lap pace seems unaffected. Not a huge problem as it stabilizes after that but I can't say I'd noticed it before. Anyone else ?
PS - it seems to be a "software choice" and not a GPS problem because when I ride my bike the speed is immediately correct. It's likely some "fusing" they're doing with GPS+accelerometer to show a smoother running pace.