Here's a link to help you calibrate your compass.
1. This app was tested on the Nexus 6, Nexus 9, Note 3, Note 4 and Note 5.
2. In some cases the compass/sensors on your phone may need to be calibrated for this app to work.
The permission listed are only used to show an ad-banner on the home screen and to access the phone sensors so the compass will work.
To the maximum extent permitted by law, and for the avoidance of doubt and or liability, Henry's Software(Brian Henry) hereby disclaims all implied warranties or accuracy with regard to the Application. The Application and software are provided "as is" and "as available" without warranty of any kind."