Like having an old friend in your car
Theres not enough great things I can say about this app. We just drove the road to Hana today and the app made the trip effortless. The drive itself takes 3 hours and contains 620 turns and 59 one lane bridge, the being GPS driven helped make sense of what we needed to see and what was "so-so" based upon how long you wanted to sit behind the wheel. I highly recommend it to anyone whos contemplating driven this magnificent route.
Bobby Dacron about
Road to Hana Maui GyPSy Guide