Developer: 正行 Akamatsu
Price: free Download on the App Store
There's not much you can say about Masayuki Akamatsu's Compass Free because it just doesn't do much. Actually, it doesn't do anything. Launch the app and you get an image of a compass with a shaded area that runs from the edge of the screen to the center of the compass. The shaded area's position relative to the compass center depends on the time of day.
The idea is that you lay the compass on the ground, put your finger in the middle of the compass and then pivot the iPhone until your finger lines up with the shaded area. When you do that, the N on the compass indicates north. I think a stick in the ground would work just as well.Or maybe you could find north by looking at what side of the trees moss grows on like they teach Boy Scouts.