I just read on the forum that someone was able to sucessfully back up their Nav DVD using a double sided DVD.
I'd like to get more information on this as well. I think I have the latest Nav DVD - however - for the next Nav DVD release... It would be nice to copy for back up purposes of course.
Now... there is also some information concerning the upgrade DVD vs New Version Nav DVD or SOMETHING like that. There was discussion of some kind of circular marks on the DVD.
I will follow this thread.