Peer to peer positioning for mobile phones

Hi all,

Saw this, and is very cool, especially in context of last lecture.

http://gizmodo.com/gadgets/apple/iphone-gps-hack-works-301459.php

Basically, "Some people with a GPS device collect the location information of cell towers and wifi access points. Then they share it with the rest of the network and everyone else who doesn't have a GPS device can then simulate a Virtual GPS thanks to the data collected by others."

They have made an iPhone app which does this, and then sends data to the builtin google maps :)

iPhone GPS! w00t