From James Associates:
Automatically records your track in the background as you hike. Mark waypoints conveniently right on the main map screen. Set a quick "Go To" waypoint or an entire route to view the direction, distance, heading, and Estimated Time of Arrival. Email a GPX file of your tracks, routes, waypoints, or location to friends. Import GPX or LOC waypoints, routes and tracks by email, by Dropbox, or through iTunes. Display an elevation profile graph of your hike. Forever-free access to all USA 24K topo maps directly to your device. Store up to 200 maps at a time to use anytime in the wilderness without cell service. Your choice of USGS or US Forest Service maps...or both. Tap "Help" for immediate easy-to-follow guides.