The sat-nav manufacturer TomTom has filed a patent for presenting directions overlaid on top of a real-time video feed of the road ahead rather than the graphics used today. Hopefully it will be a night-vision camera otherwise it would be useless after dusk. This is a great idea, but I can’t help but feel that a heads-up-display where the instructions are projected onto the windscreen in front of the driver would be easier to implement, cheaper to produce and safer to use. A few high-end cars already use HUDs for speed and gear selection info etc.