It doesn't work
This app was used once on my iPad Pro then deleted. (The new appstore omits dates on version numbers or reviews--this review was done Oct 28, 2017). It seems to think "west" is really "north". If I face "north" according to the app, I'm really facing "east". There are no instructions with the app and no way to recalibrate it as far as I can tell. I like its clean appearance but without calibration it's useless. Two other free compass apps I downloaded at the same time work fine, so this one's gone.
