Sat-nav to save the environment

A mildly-interesting BBC News article on proposed uses for the up-and-coming Galileo satellite system developed by the European Union and the European Space Agency. The system should be fully-operational by 2008, hopefully operating with "complementarity" with the existing GPS and GLONASS systems, and promises sub-meter real-time accuracy (Note: I'm not sure how, but it's certainly do-able).
The BBC article highlights an application for shared electric cars that could be located online, picked up and dropped off anywhere. I just got here so I don't know whether this has already been discussed for programs like the Bay Area's City Car Share program, but it seems like a natural direction (even without sub-meter GPS).