I have a Lenovo K note. This app (older version) worked great on my old Samsung phone. But this one just hangs or keeps asking me to calibrate the phone compass. And no matter what I do I just cannot calibrate the compass. I have tried the method the small animation shows as well as the figure 8 video. I have uninstalled it and reinstalled it several times but it's of no use. Developers  please look into this.
March 21 2017