Went for a run on the treadmill today with my Forerunner 245. I noticed at the 1mile mark that the watch was reading 0.7 so I stopped the activity and calibrated it to 1.0 miles. I ran another 1.6 miles at my watch was reading 0.7 or something. When I went to calibrate it, I actually could only calibrate to 1.5 (the 1st decimal point only went 0 to 0.5), which I did. THen I ran for another 0.6 miles and the watch still said 0.25. It seems like the calibration actually got WORSE each time I entered in the treadmill distance.