Generally speaking, the mountain is behind the house, and the front is called the direction. The unitary orientation of Maoshan is to sit in the unitary orientation, that is, to sit east facing west. You Shan Maozhi is the opposite.
Let's talk about the general measurement method first. First find the main entrance of the house to be measured and go straight for about three meters. Put the compass flat on the waist or on the ground, so that the surface of the compass is horizontal, and remove the surrounding metal objects, including mobile phones and belts. When the disk is horizontal, let the red line of the compass coincide with the central axis of the house, and turn the inner disk of the compass so that the minute and noon lines are parallel to the magnetic needle. When viewed from the top, the magnetic needle coincides with the secondary line and the noon line on the disk surface. Observing, the direction indicated by the big red line on the outer disk of the compass, the direction of the house is the mountain, and the front of the gate is the direction.