That means 500 million GPS phones walking around in cities and towns, creating a powerful two-way sensor network that Nokia and others can tap for selling targeted advertising, friend-finder services and city guides.

FORBES: Nokia Redraws The Map

As Dash Navigation has shown us, GPS units become better and far more useful resources when they can tap into a live, two-way connection, and WiMAX would be well-suited to delivering an Internet radio or even video service to the vehicle.

ENGADGET: Switched On: The WiMAX Window (Part 2)