Hi Christopher, I suppose it depends on the SatNav unit in the car, others may know more and what it needs. It might be NAVTEQ for the 4200 units?
My 2004 QPV had the Blaupunkt unit which took the Tele Atlas TravelPilot DX cds. I just looked on eBay for the latest one I could find – a 2009 (I think I paid about £40 for it).
None of the units back then were brilliant anyway so I mostly used my phone!
