Chinese Compass Navigation Instrument

Timeline

1. 1400–1570Longjiang in Nanjing and the Fujian coast · ChinaBy the 15th century, Zheng He's fleets had combined the water compass, star-navigation techniques, and rhumb charts such as Shunfeng Xiangsong for ocean voyages. In the early 16th century, multi-layered compass dials were marked with the Twenty-Four Mountains, Eight Trigrams, and Heavenly Stems and Earthly Branches; the magnetic needle was fixed with wax or oil at the center of a bowl-shaped water dish for stability. Rhumb charts recorded headings and watch-counts between ports, forming an East Asian tradition of magnetic needle navigation knowledge.
2. 1571–1580Yuegang and Ningbo · FujianAfter the Wanli Emperor's accession in 1572, although the maritime ban policy tightened and loosened fitfully, private merchant vessels from ports such as Yuegang still carried compasses on routes to Southeast Asia and Ryukyu. In the 1570s, compass makers in Fuzhou and Zhangzhou were the most renowned; dials were divided into sea and land types, with sea compasses having coarser graduations and more stable needles. Alongside printed works such as Zhinan Zhengfa, folk navigation knowledge continued to be updated along the southeast coast.
3. 1580–1700East Asia and Indian Ocean trade networks · Indian OceanAfter 1580, Chinese compasses spread to Southeast Asian ports via merchant shipping, and their graduation systems evolved independently from those of European magnetic compasses: the former emphasized the Twenty-Four Mountains and a fusion of feng shui with navigation, the latter emphasized 360-degree division and coordination with astronomical observation. The two traditions coexisted in crossroads ports such as Malacca, jointly supporting East Asia–Indian Ocean private trade networks of the 16th–17th centuries.