GPS mission is a new app on the iPhone and a web based application. It says the world is your playground, you have an online mission editor with which you can edit the mission flow, bonus items users can collect, define photo tasks, and edit other details. You have direct access to the map and can connect these things to locations. This is quite similar to what we worked on some years ago in the Remote Access to Field Trip Project (Beside the Videconferenceing things). Nice interface on the iPhone, well used combination of gaming location based services and multi interface stuff.
You can share and distribute your missions with others.
Try it out! Soon you can play some of my mission in Bonn if you come to visit 😉