I have recently bought a S type 4.0 Sports. Year 2001. The navigation system seems to work fine but I dont know if it has been updated. The disc in the drive in the boot has the Jag part number: XR83 10E898 AC and the Denso Part: 463200-5062. Can anyone advise: 1, How old is this CD? 2, How do I update it (economically!!)? 3, Has anyone fitted a new nav system into the same 'hole' in the consul as the original? Many thanks, Steve