If you're inside a building, a GPS receiver cannot find you. But a $40 radio chip from Rosum Corporation will do it, with the help of TV signals. This start-up says that TV signals are 10,000 times stronger than GPS signals according to this article from Mercury News. Right now, these chips are at the prototype stage, but navigation products able to track an individual within a city should be available next year. And Rosum even thinks to integrate these radio chips in future cell phones. Meanwhile, the military envision to use the technology as a full GPS backup system or to track soldiers in dangerous environments. Obviously, privacy advocates warn that the technology could be used to locate and track people without their consent. Considering that one of Rosum's investors is In-Q-Tel, the investment arm of the CIA, we should look at this technology with caution. Read more...