Im a hiker and backpacker. I purchased the app because it had info on most of the big parks I want to visit. What they dont tell you is how little info they give you in the app. Then they charge you $14.00 for "the full guide" to all the parks. Well I got suckered into that one, only to find out that they give you barely any additional info despite the larger sum. Save your money and visit the park service website where you can download all the info you want for free and itll have all the latest info you need as well.
Ravens Maven about National Parks by National Geographic