Originally Posted by
Inusuit
Don't have that problem. I have a Garmin 'Edge 25 and an Apple watch. Over a 20-30 mile ride, the two units are often within .2-.5 mile for distance. The spread seems wider if I stop multiple times. Sometimes lay out a route on Google Earth Pro. Garmin and Apple are usually fairly close to the mileage reported by Google Earth. I'm not concerned over relatively small discrepancies.
The difference in difference over longer distances tends to be small. Most people here should realize that.
The OP was talking about over one mile. We have no idea what the difference the OP saw.
(Cul-de-sacs and turning-circles aren't really a particular problem,)