It detected the directions right. Would be better to make the compass calibration easier coz the current method made me drop my phone twice and I still couldn't successfully complete it. Edit: Glad to have received response from app developer and Google is to be blamed for such a tough calibration method. Nevertheless  I'll use it for a while before bumping up the stars. :) Edit2: Just saw that this is an opensource app. That deserves an extra star for sure! Edit 3: Calibration works great in my Oneplus 2.
June 01 2016