We were skeptical about this app but a concierge at our hotel recommended it after we insisted we would do the road to Hana on our own and not purchase a tour package. Even with all our research on places to stop, it is difficult with maps to figure out where exactly you are trying to stop. Plus, we would have spent so much time with that there would have been no way to tell the kids about any of the rich history. The app warned us when to expect to turn off, where to park and made suggestions of places to stop. When the kids were passed out on the way back we listened to the rich history of Maui and the Hawaiian Islands. Seriously the best $5 spent!
BI Mom of 3 about Road to Hana Maui GyPSy Guide, v1.4