Notes
At the Alpharetta Big Creek Greenway doing 8 easy wearing both the 310xt and 920xt as has been the case for the last week. Targeting an 11:02 because of heat and humidity. According to my 310xt I was doing it, but according to the 920xt I was not. This data is for the 920xt.
920xt measured 8.32 miles and the 310xt measured 8.41. How is one to really know?