This app works. And it look awsome. Had it on several of my phones. Now it on my lgv30 wich is the most awsomness phone iv ever had. And very accurate. And as far as i can see it hasn't been intrusive to my phone...
I find it a very useful app.
Not only an excellent UI, but by far the best calibration controls of any compass app.
Extremely useful, very quick and clever.
Seems to be right on the money.
Bugfix in latitude / longitude format