How to use the geomantic compass? Look at the geomantic compass in home decoration. How to use it?

I am a designer, but when we help our clients design their houses, we will consider some aspects of geomantic omen more or less, so as to ensure that we can meet the best requirements of our clients. Therefore, we still have our own views on the use of Feng Shui compass. Please tidy it up and talk about it for reference only. If you need more accurate data, you can consult Feng Shui.

Determine the sitting direction of the Yin House: Method: Generally, stand in front of the tomb and hold the compass at the waist position with both hands. When it is judged that the edge of the compass (with box) is perpendicular to the front of the tombstone, adjust the disk surface to make the pointer aim at the magnetic north pole, and the front and rear degrees of pressing "Tianxin Shidao" are mountain degrees, the tombstone side is mountain, and the side is direction. For the sake of accuracy, it is best to start from the tombstone, then take a step back and choose one or two points for measurement; If the tombstone is smooth and flat, you can first flatten the border of the compass on the tombstone, and then step back a few steps after measurement to check whether it is consistent. If you use compasses, the best way is to use the same "alignment method" as carpenters saw boards or plasterers built walls, that is, first pull a yarn (usually red yarn) perpendicular to the tombstone, and then lay the compasses flat at the lower end of the line for measurement.