There's nothing like having a good set of topographic maps when you are hiking in the back country. Paper maps are the de facto standard, but they tear easily, get wet in the rain and can easily blow away with a stiff gust of the wind. If you have an iPhone in your pocket everywhere you go and want a more permanent set of maps, then you should check out Topo Maps+ from Glacier Peaks Studio.
As someone who spends a lot of time outdoors, I can reliably say that the most important feature of Topo Maps+ is its support for offline usage. You can be deep in the woods, far from any cell signal and still use the app to navigate from waypoint to waypoint. Before you hit the trail, just remember to download the map
