Tomtom is hard at work on R&D and are currently researching a brand new way for gps navigation through real time video. They filed a patent in Europe which describes the technology as
“superimposing or combining navigation directions over a camera image, a user-friendly view is presented to the driver that allows easy and rapid interpretation. There is no need for the user to translate an abstract representation of the real- world, because the camera image is a one-to-one representation of the real-life view as seen by the user.â€
The technology could be implemented in a portable device integrating a camera and capturing the images through the car windshield. This technology is still in research and will not make it to consumer devices soon.