I went running last week and today with my new Forerunner 255 (with HRM Pro Plus Band).
The tracking distance with my watch is 5,11 km (last week, same route, 5,2 km). With Google Maps, the distance is 7,0 km. I had before a Polar Ignite, the distance tracked with the Polar was also 7 km.
This is a difference of nearly 2km in a total of 7 !!!
What is wrong?
Left, the km Points with Garmin Connect, right, Google Maps