Introduction to water compass: In ancient China, a compass made of a compass was generally used to determine the course and orientation during maritime navigation in my country, so the route was called a needle path. The compass used for navigation in ancient times was generally a water compass (also called a water compass), which was based on the four dimensions (Qian, Kun, Gen, Xun), eight stems (A, B, B, Ding, Geng, Xin, Ren, Gui) and The twelve branches (Zi, Chou, Yin, Mao, Chen, Si, Wu, Wei, Shen, You, Xu, Hai) are divided into 24 directions.