BackCountry uses free topo and aerial maps for the United States, downloaded directly from Terraserver-USA, or from a few other sources, but I was familiar with Terraserver-USA from my mudding and rock crawling days. There is aerial photography in most areas at up to 1 meter pixel, which came in pretty handy when we needed to see if a particular run had trees and boulders on it, or if it was clean.
One of my favorite features was the ability to get the maps in any size or area we wanted them in, there was no prepackaged maps or anything of that sort. It made it very easy to make our maps just the right size and see what we needed without having to search for landmarks. Map data is public domain, so it's all free to use. It was also great having to bring the phone and that's it to get any navigation help we needed to. In the past, we had tried a handheld GPS , but it was hardly ideal for use in the mountains, and many times it would jump to the nearest road, we didn't want to spend the money on a dedicated hiking or camping GPS, and it seemed to want us to stay on the road, this software worked great on the other hand, and for the cost, you can't beat it.
Here are a few of the main things the software lets you do
Automatically loads multiple map scales, and displays them at a variety of zoom levels. You can freely pan and explore the area of your downloaded map.
There are also a number of ways you can add points of interest to your newly created map.
Define your own custom waypoints, limited only by the size of your storage card.
Import geocache waypoints from LOC files to see them on the map.
Import other GPX files for waypoints and tracks marked by other GPS users.
Armed with a feature filled map, navigate in the outdoors with the help of a GPS Receiver.
Use just about any GPS receiver that sends data in NMEA, most smart phones will have no issues doing this, it's all automated.
See your position on a moving map and navigate to waypoints of your choice with the compass control.
Mark your own trail using the track recording feature. Export your track and waypoints in GPX format to share with others, or to view in Google Earth or other desktop software.
Have fun trying the software, and get lost in the outdoors, BackCountry will get you in AND out!