If my watch reads say 1.05 miles, what do you round it to (i.e., in tenths of a mile): A) 1.0 or B) 1.1? The answer is B) 1.1. I often walk a 1.05 mile distance, but GCM gets it wrong and enters 1.0 in my records. Imagine what that does to your pace. Garmin please fix this.
Yet you could be assuming that what your watch displays is exact, when it could actually be 1.049 miles on record but rounded off (in this case, with the same outcome as rounded up) to 1.05 miles because the device is programmed to display (a fixed width of) two decimal places for distances, but if the Garmin Connect Mobile app is programmed to display only one decimal place, therefore rounding off the value to 1.1 miles.
smw856 Not sure I fully understand you anyway. I run for 5.25 miles and that is what shows on watch and in Connect - it is quite possible that the 5.25 may be 5.245 or 5.254 but it's accurate enough for me particularly given the margin for error on GPS anyway. But I don't see any inconsistency between device and GC. Which device are you using and does GC on a PC show the same values?