Maybe there is a misunderstanding....I have a navigation dvd that came with my car...but it only has North America on it not Hawaii...DENSO Corporation and NAVTEQ do not know when they will be making a navigation disc to include Hawaii...so basically my sales man sold me a $1200 upgrade that is "rock" unless i create my own map disc with files from a Cadillac or Hummer disc that includes a Hawaii map "WHICH IM WILLING TO BUY"....but first I want learn how to do this...I'm just asking for the technical expertise here first before I make the investment....HELP PLEASE with my $1,200 dollar "ROCK"....Thanks in advance