Even though using a cell phone app clearly makes you less of hunter than those who do not i do still have some that help me in my short comings... (that was sarcasm).
1)the whitetail freak app is great for areal photos, and marking stand locations/ property boundries/cameras/ anything. But like was stated above, google earth works just as well.
2) also, a cheap little flashlight app has been helpful in some instances... it sure is nice to have something handy while packing up after dark if you didnt bring a flashlight or the batteries have recently died.