All in all a very good and easy to use app with the Yellowstone tours generally "better". The Yellowstone tours had directions from each entrance of the park and proceeding along the park roads in either a clockwise or counter clockwise direction. This allows you to start along an interior road in one direction getting tips as you drive and then if you want to turn around, perhaps heading back to your lodging, simply close the tour you are on and then load a tour going in the opposite direction. It will be repetitive because it will play the same tips you heard before you turned around but good because it gives you the information at the proper time for your location. (Information is given as you approach destinations so you can make turns or look for turnouts) Grand Teton on the other hand only lays out tour in a given direction, one entering from north and second from the south so the flexibility in the route you would like to follow is not as good. Good and interesting information in both. It is critical that you download not just the app but each individual drive you may want to follow to your phone before you head out. Availability of cell service or WiFi may be very spotty once you get to the parks and if drives are not downloaded you may not be able to open a drive.