Runner 2 inaccurate along river
I noticed that I am always going faster than expected when I run along the Thames, so I suppose the distance is not measured correctly. This happens both when I go along build up parts and along towpaths. I think my old Garmin was the same, so I don't think it's aTomTom specific problem. Now I wonder what the difference is in %, so I can add the extra distance if I want to do a specific number of miles. Does 10% sound right or should I add even more?