There are already plenty of GPS apps that let you use your iPhone to find your way when spending time in the outdoors. onX Backcountry Ski Maps is made for those of you who enjoy outdoor winter activities. It turns your phone into a GPS navigation system and trail-finder. You can use it to explore fun trails all around you.
This app comes with accurate topo maps and helps you find campsites and other points of interest. It has description, difficulty, elevation, photos, and other relevant information for your trails. You can also view 3D maps to better understand the terrain and plan your routes. onX Backcountry for iPhone can also track your adventures.[where to get it]