APCompass, by David Wiltshire, is a database of wireless access points that you can add to using a gps handset.

The system uses GPS technologies integrated with a community maintained database to allow people to explore their local wireless networks. There is an emphasis on pioneering and exploration as users seek out new nodes to extend the database. Every action performed by the user is broadcasted to a central server for anyone to see. Drawing on David Brin’s idea of a Transparent Society, APCompass encourages collaboration and accountability as users appreciate the fact that their actions are being constantly monitored.

Thanks Chris.