An interesting demonstration at a tech conference by Navizon ITS can be found here.

Anonymous indoor positioning here we come...

Copyright: Technology Review

Copyright: Technology Review

See this demonstration to see how indoor tracking works. Essentially this approach is now being used in shopping malls and the like. Theoretically, depending on how far these nodes extend people could one day be tracked back (albeit anonymously) to their homes or place of work. I have written about this with Roger Clarke here.