Hi, Just bought my C220 cdi (2006 Model). it has factory fitted Nav command sys but the previous owner did not have any user manual for nav command system.being a bit familiar with other gps/nav system i got is working on basic stuff.But would like to know more, could some one help please?? in video mode, should it play normal dvd's. The current nav dvd version v4, does not have any safety cameras info, is it normal?? many thanks in advance.