If you have all these things - GPS, Dash Camera, Radar Detector and so on - you will soon end up with no windscreen to look through as it is covered in devices and a mass of curly cords - and not enough sockets to power them all.
First company that produces merged devices is on to a winner I reckon.
Some dash cams have GPS to tag the footage, but none seem to actually navigate too. Are there any that do?