National Park Trail Guide funktioniert nicht

National Park Trail Guide is your comprehensive guide to hiking and site seeing in our National Parks. • Currently packing complete trail data and hike descriptions for many of your favorite National Parks, including life-list destinations like Yellowstone, Yosemite, Grand Canyon, Zion, Grand Teton, Mount Rainier, Point Reyes, Rocky Mountain, Zion, Acadia and many more! • Search for hikes using the map or a park's “best of” list curated through star rankings from the community. • Never get lost again! • No cell signal needed.  Want to target the park’s most beautiful features? View our list of Gems. • Other cool features: Create a to-do list, track your hikes, or send your exact location to help in case of emergency. • The app is completely free--it’s our gift to you as part of the National Park Service's Centennial Celebration.  The data is available offline, and your phone uses its built-in GPS to show your location. • Plan the perfect trip for you, using our hike difficulty ratings, elevation profiles, star ratings, and informed insights on seasons, camping and lodging, guided tours, food and drink, and more. • Traveling with kids?  By using GPS, we can show your location on trails and vertical profiles.  We have an expert-selected list of Family Friendly Hikes.  Continued use of GPS running in the background can dramatically decrease battery life.