I confess, I have been puzzled why the emphasis has been on map display so far; the CARIN system simply uses the GPS sensor to do dead reckoning on a vector map (publically available) and then just displays an arrow pointing the direction you have to take, along with a synthesised voice warning. You don't even see a map even when you enter your route - it works on Postcodes.

One of the few remaining Mk1 owners... #00015