2. At this time, the crosshairs on the compass should coincide with the front, back, left and right positions of the house. If the crosshair is not in the right direction, the measured sitting posture will deviate.
3. After fixing the crosshair position, move the inner disk with both thumbs. When the inner disk rotates, Tianchi will rotate with it. Turn the inner disk until the magnetic needle stops and coincides with the red line of Tianchi.