This is my first torrent. (second try, actually) I hope it's useful to people. Please read all the text to insure success.
Why: I just bought a used GM product and it didn't have the navigation disc with it. When I asked the dealer about the missing DVD I was told that almost none of the vehicles in the used car auctions come with the DVDs. This is due to dealers or car handlers taking them out to sell them on ebay. The same happens to key fobs. Paying $200+ for a replacement is crazy considering that these built in GPS units have too many limitations and are often far worse than a stand alone unit or even an app for a smart phone. But my 'new' ride has a built in GPS so I'm going to have it available.
I researched the web and found GM 'updates' have been pretty lame throughout the years and the first decent update was the one I have here. Since there wasn't any torrents available I got one and made a backup as outlined below. The backup is what I currently use and it seems to work fine.
Compatibility: It's my understanding that this DVD is compatible with..
08-12 Enclave
06-11 Lucerne
07-10 Escalade
07-09 Equinox, Torrent, Outlook & Vue
07-12 Traverse, Acadia
(some of these years don't seem right, but it's what I got off a website)
How: I'm writing these instructions so there shouldn't be any questions, however, if it works for you please leave a comment letting me (and others) know and seed as long as you can.
1. You'll need to have a dual layer DVD. I used 'Verbatim DVD+R DL'. It's important to know what your DVD writer can do. Mine could read +R and -R but only write +R DVDs. Be sure to buy the correct format DVD.
2. You'll need to open the ZIP file. It was created with WinZip so I don't think there should be any issues.
3. I used Nero Express 10 to create the 'nrg' image file. If you cannot work with this type of file there are some converters out there, but I have tried them. I only know that my method worked.
4. The DVD drive needs to have it's 'book type' changed to DVD-ROM. I didn't see a way to do this with Nero Express so I opened Nero Burning ROM (version 10) to burn the image on the blank DVD. I set the 'book type' selecting the 'burner' pull down menu and selecting 'choose recorder'. Open the Options and change the 'book type' setting to 'DVD-ROM'. There was a confirmation box that pops up. Click Okay.
5. Open the 'nrg' file. I left the write speed at 'maximum' but if you have problems verifying you may want to set this to a slower speed.
6. Select 'Burn' and you're off and running. Nero (version 10) will take about 25 minutes to write the DVD at 4x speed. You should also notice some confirmation that the DVD is burning with the 'book type' set to 'DVD-ROM'. I recommend not using the computer for any heavy processor use during any burning. When it's done burning Nero will verify the data at various speeds and report the good or bad and kicks out the DVD.
Pop it in and give it a go. If it works or if you had success with a method using these file, please outline your process in the comments to help others out.

22925280 GM Navigation DVD Ver 10.3