The app works on Apple and Android smartphones and tablets too:

As briefly as we can summarize:
You can pan and zoom the map with the usual touch motions.
You can tap on a trail to see the basic trail info and the info button to read the full description and status notes and cautions and most recent trail report.
You can tap on a service waypoint to see information about that waypoint (we’ve been adding pictures to lookouts so that is fun)
toggle showing your position and the orientation of the map
record your travels
legend and to turn on satellite view and precipitation maps
quickly share your location via text message or email or other services on your phone
search for locations and services and trailheads *new*
drive mode – try it and see
menu to set up your profile, share your location, app settings, and ONLINE HELP!! (better than this guide)
Follow along for tips and tricks when using the ON4Maps app
