Real-Time Location Sharing on GPS Phones

Via Augmented Reality Gaming, Mologogo is a free service to “track” friends with GPS enabled cell phone. It only works in the US and I am not sure how such a service would be perceived in a non-GPS friendly continent like Europe. For example, it would be useful to make the positioning less accurate and augment the map with the name of the place (or use the map in unknown places and drop the map and only use the name of the place in known locations).