Sale has ended but you can still get this app.
Download Zion Park Tour Maps Aligned Offline Now

Official Description

Conserve phone battery while knowing where you are when visiting the Zion National park offline with the offline maps

The offline tour map is scaled to online maps and offers more detailed information than the online maps. They bring you a peace of mind when you know where you are whether internet is available or not and you are in/outside the Zion National park!

In case you get lost, plot your location on the map with the latitude/longitude and notify people know your exact location.

You can do lots more with the app such as recording then sharing your trips as named trails with friends, displaying your friends locations, contact sharing, note keeping, timer, fitness etc.