M Henderson
Lots of iron ore near me make such apps as this great for finding lot line azimuth. The one degree rotation precision allows me to use the long edges of my phone as a sight guide. Adding a bubble level would make it more accurate. Also, making the sun vector as large as the compass would allow for more accurate alignment with the sun's shadow on the screen. A sighting compass mode sounds like a good idea at first, but the accelerometer drift in my phone makes that approach inaccurate.