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1. If your device doesn’t have a magnetometer ,app will probably not work, try it!
2. Check you are away from any magnetic interference
The compass sensors are very sensitive to interference. Make sure you are holding your device away from any electric cables/magnetic objects. Also check you don’t have a magnet on your case as this can interfere with the sensors.
3. Try calibrating your device
Over time your sensors can stop working accurately. Try re-calibrating your device using the following method:
Wave your device in a figure of 8 pattern rotating it in different directions as you do this. If your device is very hot you may need to wait for it to cool down. You can also try switching it off and on again. Be patient as this can take a few minutes to work.