i got a 3m ciggy adapter from maplin coil style... then used the existing ciggy wire from the road angel navigator...
plugged the coil on into the boot ciggy socket, ran it behind the seat and hid it down the side, then plugged the road angel cable into that, ran it under my seat matt, under the seat, then under the drivers matt, then up the side of the door, and it just plugs in behind the navigator cradle.
easy.