I am surprised that you got any info or guarantees on the navidrive system as none of the dealers I have spoken to know anything about it. My gripe is that citroen.com states. "The new generation NaviDrive system is available on the Citroën C8, C5, C4 and C3 (depending on the country). It offers a number of essential functions: a GPS navigation system, a GSM dual-band hands-free telephone with access to the address book and audio system (radio and 6-CD stacker). At the same time, passengers can use the screen or voice synthesis function to read the SMS messages received over the phone." Yet mine only has a 5 cd-stacker. When I bought the car this was the only information I could find on the navidrive system, the salesman knew nothing about it. Then when I complained about the 5 cd stacker they said they are all like that. Citroen uk just fobbed me off with "ignore that website it's french".