upgrade sat nav sat nav cd????

[CHRISS3]

Hi i currently own a 2002 s3 with tv and i want to upgrade the sat nav cd its currently running a 2002 version i was hoping to get one on ebay as ive seen versions from 2006 do you know if these are compatible ??? or are you not able to upgrade the cd ive been looking at tele atlas 2006 dx

hope you can help


thanks

chris