The Kosher Backpacker Appalachian Trail Guide App includes all of the things you need for your thru, section, or weekend hike of the Appalachian Trail. It is available for both Apple and Android devices on either the App Store or Google Play.
Trail guide features:
Maps (live and NPS)
Waypoints
Distance between shelters
Trail alert push notifications
Elevation profiles
North bound / south bound settings
Post office locations
User contributions on water sources, features, Trail Magic
Database of shelters, huts, hostels, towns, landmarks, and features
iOS Version displaying “Live Maps” feature
But there’s more, since this app is designed to sustain the Torah-observant hiker:
Zmanim to help you track Shabbat and holiday times
Trail-friendly synagogue listings
Torah portion listings (with option for triennial cycle readings)