I work in car parts wholesaling and we sell boat-loads of satnav SD cards from all the major manufacturers. Nissan's is pretty expensive, as they go, but a couple are over £200.I have a 3 year old Nissan with built in GPS and thought it might be time to update it when it was serviced last week. How much for a new sd card with the latest maps please? That would be £149 sir. What? I could buy a new Garmin for less than that with free lifetime updates and the annual service on the car only costs £189! Does anybody actually fall for that rip-off?