Considering the wildly varied performance of smartphone GPS implementations I'd love to use this to build my own WAAS emitter so that when me and 10 of my closest friends play ingress we're where we are supposed to be. But that would be based on using a higher accuracy source (think pucks that have better antennae, higher accuracy GPS chips and can see the other satellites as well).

Unfortunately I don't think some people could ignore the potential for abuse. If only I could be 15 feet to the left where the other guy's crappy GPS puts him. At some point I'm hoping my city will put up a few WAAS transmitters to help in the glass canyon that is our downtown.