Great App

I am using this on the 1st gen iPod touch and it works great. You have to make sure that you load the app and your route before you start running. I actually does track where you are using the wifi. It worked for me anyways. It works really well when you create a route on the website and then it automatically loads your routes from your account. Its really easy to create routes as well. I ran with a GPS unit and compared it to the route that I created. The GPS said 4.89km and the route was calculated at 5.1k - so thats pretty close. But the accuracy of the routes is probably dependant on Google Maps. If your looking for exact accuracy then get a GPS. But for 2 bucks, and to create a free account, you cant go wrong.
I definitely would recommend it for any runner!

chaines about WalkJogRun GPS Running Routes