I have used the search feature... (spent 2 whole days reading up on everything that has been done and tried)
I see that people have tried using the 350Z maps etc but i want to use the japan maps but change the data in the map files. (again i haven't seen the map dvd format yet {and cant see one online to download}) but I cant believe you cant reverse engineer them and drop in at least to begin with, the australian map. It might take longer to sub in the roads etc and actually get it to take you places.