Does the compass on the geomantic compass measure the north and south of geomagnetism or the north and south of latitude and longitude?

The compass on the geomantic compass is only a general guide and can only measure the magnetic direction of its position.

If you get off the plate in the house, because there are steel bars on the walls and ceiling around the house, all the electromagnetic waves emitted by the electrical appliances in the house will affect the magnetic field in the house, so measuring every point in the house with a compass is different. You can know by measuring it at every point in the house with a compass. Even if it is the direction of the gate, the position of one or two feet before and after can give a completely different direction. Therefore, feng shui masters usually measure the direction of the house outside.

The outdoor measurement is close to the geomagnetic north and south, but there will be deviation. The source is nearby buildings or mountains. The closer the distance, the greater the impact. The greater the wind, the greater the deviation.

Not to mention the north and south in latitude and longitude, it is only a theoretical standard unless it is measured by professional tools and methods.