I'm using Vivomove style with GPS connected to iPhone 12 Pro and for some time now, I'm getting up to 15% incorrect walking distance. If I'm using iPhone 12 Pro alone (running some app within it like Strava) the phone itself collects correct distance. After exporting .gpx file and uploading somewhere which can decode and measure distance, I can clearly see those 5-15% differences from the data in Garmin web page, so seems it's like issue with Watch / Garmin? Any idea how to solve it?
