Depends on how new the car is as to whether its the older MFD2 sat nav unit or the newer RNS510 Touch Screen sat nav unit.
The MFD2 unit should come with a DVD which needs to be permanently inserted when using the sat nav - there are various versions fron v1 to v5 or 6 - ther latter ones being more up to date.
The RNS510 unit has a 30gb built in hard drive and the maps are usually pre loaded onto the hard drive for ease of use.
Either way they should have maps of the whole of Europe on them as standard.
HTH
