I've had better accuracy with a foot pod, plus it's a smaller unit. Both the GPS pod and Foot pod can be calibrated, to increase accuracy (I've got mine to about 98% accurate)Just do 4 laps on a track (or other known distance)then adjust the mileage on the watch. Once you've done this it should be almost exact.

The pod itself fits into an armband which has a velcro strap. You put it on like you're getting your blood pressure read. Of course it's smaller than that...a little larger than those i-pod armbands.As for correctness, I can't verify that it is better than a footpod (since I've never run with one) but my GPS Pod does give consistent distance readings for the same route over multiple sessions. Compared to Google Earth, my GPS distances are reasonably accurate. Compared to my friend's Garmin, my GPS distances are consistently short by about 0.1-0.2 miles. Not sure which to trust though.....