It seems that most car nav apps are available worldwide except Japan. The only reason I can think of is that there most be some bad ass nav app specifically for Japan made in Japan. Unfortunately I don't think this is the case because I can't find squat. Only crappy little ghetto apps. I use the Apple Maps app and it provides great turn by turn accuracy but it's nothing like a true car nav app. Why do these companies have North American, European and sometimes even Chinese maps but none for Japan? There could only be one reason since language is obviously not a factor seeing as Chinese maps are available. Maybe small market? Everyone here uses car nav systems though so it's a little strange as to why there are no solid Navigon/Tom Tom like iPhone apps.