Guys, looking at the above recent comments I think it's worth mentioning that map discs and Operating System (OS) discs are different things.

RacerX5 - you mentioned "original nav dvd", so from that I think you're talking about the map disc which stays in the unit all the time. These are released generally twice per year and eBay is a good source for these, or your local dealer of course. This thread is on the subject of v31, which is an OS update. In summary, the first post in this thread details where it can be downloaded, you burn that to a CD and run it in accordance with the OS update procedure which was kindly posted by ccfj1 in post 167 on the following link :

http://www.xoutpost.com/navigation-sy...ilable-17.html

This updates the nav unit's software and the map disc is then reinserted.

I thought it worth mentioning as it appeared that there was a little crossover confusion occuring.