How to use the geomantic compass?

1, you must first put the iron and electrical appliances (mobile phone, walkman? ) or anything that will interfere with the magnetic field of the compass.

2. Pay attention to the fact that there are no ironware, mobile phones, telephone poles, electric boxes and iron towers near the survey site? Objects that interfere with electromagnetic fields.

3. The disk surface of compass or compass (north) needle must be horizontal, and the pointer cannot rise or fall at the same time. At the same time, we should also pay attention to whether the joint between the compass surface and the disk body is tight, and there should be no looseness or damage.

4, check whether the compass or guide (north) needle is normal, if bent, it shall not be used.