I am intending to rent a car to the outskirts of Sydney and was wondering if the GPS on the data network is reliable, especially at places like Blue Mountains and Port Stephens. Or am I likely to get no signals? When I was in the U.S. most of the country roads have no mobile signals at all. Not sure what it is like Down Under. Please advise.
The car rental charges about A$60 for the GPS for 3 days. I think that seems a little pricey. Since in my own country, I also use google maps instead of my car's GPS, I thought perhaps I should get an optus card with data plan to use for GPS. Or is it safer just to get the GPS from the car rental company?