No offense to the factory NAV, but you would be better off getting a Garmin Nuvi-350 and just mounting it with the suction cups right next to the rear view mirror. Will need Aussy maps though from Garmin unless it comes preloaded with Aus. maps down under. You can put the Nuvi in your pocket and walk around with it for finding shops and restaurants. The user interface (touch screen) is WAY better than anything you will find in most factory NAV systems that cost 4 times as much. Amazon has Nuvi-350's for just under $400 US too.