By David Harris
This app is only available on the App Store for iOS devices.
eTrails is an electronic hiking guidebook covering the Pacific Crest Trail, Orange County, and the San Bernardino Mountains.
eTrails provides multiple views of trail information, including a databook, a moving map, an elevation profile, and a conventional guidebook.
What's New in Version 1.5
Updated water sources for 2016
San Bernardino Mountain Trail 7th Edition Trips (Prerelease)
There are several PCT apps. I use this one for the great background info. Info like geology, tree life, names. All sorts of interesting info.
Tried several times...