Primarily, the compass was used for geomancy for a long time before it was used for navigation Ancient Chinese alchemists realized that the magnetite ore would point towards a magnetic north. Their ...

Da Tan is a deep pool outside the Tanmen port, and Chuan Yan Wei is now known as Xishazhou, an island of Xisha Qundao. Qian Xun is a direction marked on the ancient Chinese compass, and 15 Gengs is ...

Qian Xun is a direction marked on the ancient Chinese compass, and 15 Gengs is about 150 nautical miles. The manual covers sea routes, weather conditions, wind directions and ocean currents for ...