When was the compass invented?

Compass is the operating tool of Li Qijiao, which is mainly composed of a magnetic needle and a series of concentric circles located in the center of the disc, and each circle represents the ancient people in China's understanding of a certain level of information in the big universe system. Geomantic compass is one of the four great inventions in ancient China, also known as geomantic compass. It was first used for navigation and then for geomantic geography. Feng Shui master thinks that the compass is the operating tool of Li Qi-jiao, which is mainly composed of a magnetic needle and a series of concentric circles located in the center of the disc, and each circle represents the ancient people in China's understanding of a certain level of information in the cosmic system. Western books introducing compasses first appeared in the beginning of the 3rd century/KLOC-0, which was later than the records of Zhou Ping Carving Tan and other books 100. The deviation between water floating needle and magnetic needle was recorded in Meng Qian Bi Tan written by Shen Kuo in Song Dynasty. Columbus discovered the deflection angle of the magnetic needle when crossing the Atlantic for the first time, which was more than 400 years later than that recorded by Shen Kuo. The liquid magnetic compass is widely used in ships in modern countries, which is an important creation of navigation technology.