I just got a Garmin forerunner 201 wrist-mount GPS and am wondering how accurate the distance measurements are. I took it to a university 400 meter track and did a measured mile, and it showed 1.16 miles for distance, off by 16%. On another track, it measured 1.02 miles. Both were on open fields with good satellite coverage. On the highway, it tracks almost exactly with mile measurements posted on the side of the road, as long as it maintains the satellite reception. So how accurate is the 201, and GPS in general? I know there are a lot of variables that affect accuracy, but 16% inaccuracy under ideal conditions sure seems like a lot.