How to use geomantic compass to orient and locate?

The answer to your question is as follows

Please use Feng Shui compass or Apple mobile phone compass to measure the room orientation according to the method shown below.

The method is to place the compass or compass parallel, left and right parallel, and up and down parallel, and the compass is aligned and matched with the cross on the left wall of the hall of the house. Keep away from iron, steel and magnetic field (because iron, steel and magnetic field will affect the accuracy and sensitivity of compass)

Screenshot of measurement accuracy.