Great value

We loved this app; using it greatly enhanced our experience of YNP. The automatic commentary was informative and entertaining. We took at least two brief side trips we would not have without the app. and as a result saw some amazing falls/cascades. While it does not eat your data plan, the app is a power hog, so be sure to have a charger with you. Buy it!

Ed & Nadia about Yellowstone GyPSy Guide Tour