I tried this because it shows both true north and magnetic. I also know where I live has 19 deg of variation. Unfortunately, the app constantly shows true and magnetic to be equal. (Yes, my location is turned on) Of course that is impossible, so which is correct? Ill have to download another app to find out. Because it doesnt work, and the free version has far more ads than any other free app Ive ever downloaded, I recommend not wasting your .99 on the full version.
MV dad about Compass++ Digital - Get a great looking compass!, v3.4