The updated disc should be available at not cost from the dealer. I have an 06XLR-V that had the 04 disc. Dealer got me the 06 one and that is the latest update as I understand it.You may also want to check and see if a free update is available for the car. I have an 06 and just received my free update Nav Disc from GM. I believe all XLRs are due 1 or 2 updated Nav DVDs as part of their warranty. Check the threads on this site for more info on this.