A lot of these big vehicles on the road- Prados,Cygnuses,etc,high end vehicles - BMWs,Mercs,and some mid range Japanese rides - Mazdas,some Toyotas,have inbuilt navigation screens.
Problems is that there are no local apps for these cars e.g. translating Japanese into English,or local map applications for say German cars. I know some rally drivers might have the hook up,but for your middle-upper class car owners this may not be the case.
Anyone have any info on how to load such apps and how profitable it could be? Standalone devices could also be used I guess.