From the U.S. Forest Service:
The U.S. Forest Service now offers access to a variety of visitor maps for people using Android and iOS devices.
The app provides access to Forest Service maps,as motor-vehicle-use maps, which are free while pages from national forest atlases are 99 cents and forest visitor maps are $4.99. Prices are pending for other agency maps.
The maps are geo-referenced with the user’s location appearing as a blue dot. The app works on iPhones (3GS or newer) and iPads with WiFi+3G. It also works with Android 4 or newer operating systems on devices with at least 1 gigabyte of memory.
Through the app, users can purchase and download professionally created maps that are stored on their devices. They can use the maps based on their location when GPS is available. The maps also will allow users to measure distance and area, find coordinates, open a current view in Google maps, plot place marks, add notes, enter their own data and add photos as attributes. Almost 700 Forest Service maps are available through the app.
In areas of national forests and grasslands where Internet connections are unavailable, the app and static maps work well if users download the maps prior to their visit. The apps and maps also will be useful for wildland firefighters.
In geographic areas with Internet availability users will be able to use the products with live data. The interactive map is expected to be available on a limited basis starting in March 2014.
Download App: Android
Download App: iOS