1. At the fixed point, first measure the position of the observation point in a certain terrain or feature; When measuring, open the compass cover, loosen the brake screw and let the magnetic needle rotate freely; When the measured object is relatively large, the compass should be placed on the chest, the long level of the compass should be aimed at the measured object, and then the reflector should be rotated to reflect the object and the long sight in the reflector.
The tip of the short sight on the long sight is in a straight line with the center line of the reflector, and the compass should be kept horizontal (the bubble of the circular level is in the center). When the magnetic needle stops swinging, you can directly read the reading on the circular dial pointed by the magnetic needle, or press the brake screw to read it again.
2, the correct compass: hold the outer disk with both hands left and right, and separate your feet slightly. Then put the compass between the chest and abdomen to keep it horizontal, not high left and low right, nor high front and low back. Adjust the compass. The crosshair above the compass needs to be parallel to the gate of the measured object. After the position of the crosshair is fixed.
You should start to adjust the direction of the Tianchi pointer. 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.
Compass, also known as compass, is a feng shui detection tool and a commonly used operation tool for managing style. The compass is mainly composed of a magnetic needle in the center of a disk and a series of concentric circles, each of which represents the ancient people in China's understanding of a certain level of information in the cosmic system.