I didn't listen to this mp3 yet, but it sounds promising.

TV: Location Without GPS

Todd Young represents Rosum Corporation, a company that has developed a way to use unmodified broadcast TV signals for positioning in these places where GPS often fails. These signals penetrate buildings and are already available worldwide.

This critically useful technology is the result of work by Dr. James Spilker, the co-architect of GPS, and Dr. Matthew Rabinowitz, an expert in high-precision navigation systems. It has the potential to revolutionize location positioning and provide a base for the development of helpful new services.

See also:

• Where 2.0
• Rosum Corporation
• Rosum White Paper: A New Positioning System Using Television Synchronization Signals