The tour map is scaled to online maps and offers more detailed information than the online maps, along with the offline map bring you a peace of mind when you know where you are when internet is not available and you are in/outside the Skyline Drive - Shenandoah Parkway parks!
By using the phone offline, your phones battery can last a lot longer.
Points of attractions are searchable by key word or category and search results are then plotted on maps.
In case get lost, you can plot you location and notify people rescuing you your latitude and longitude.
You can do a lot 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.