Chinese Magnetic Compass Navigation Technology

Timeline

1. 1000–1100Bianjing · HenanShen Kuo's Dream Pool Essays recorded magnetic needles pointing south and magnetic declination; Zhu Yu's Pingzhou Ke Tan described ships observing stars at night, the sun by day, and the compass in overcast weather, marking the entry of the magnetic compass into maritime practice.
2. 1127–1279Quanzhou port · FujianThe Southern Song maritime trade superintendencies flourished, and seagoing ships were generally equipped with water compasses; ports such as Quanzhou, Guangzhou, and Mingzhou became hubs of compass navigation and ocean trade, with routes extending to Southeast Asia and the Indian Ocean.
3. 1271–1368Quanzhou–Guangzhou route · ChinaIn the Yuan, compass graduations were refined to twenty-four points or more, used together with needle-route documents and nautical charts; through Arab merchants it reached the Mediterranean, providing a precursor to European compass navigation.
4. 1391–1400Longjiang shipyard, Nanjing · JiangsuFrom the late Hongwu to the Jianwen era, the Ming court built treasure ships in Jiangning and trained needle-route specialists; the combination of water compass and star-sailing technique became the core navigation technology of Zheng He's fleet in the Indian Ocean.
5. 1405Chinese coastal ports · ChinaAfter Zheng He's seven western voyages, the Zheng He Navigation Chart systematically recorded needle routes; amid alternating maritime bans and openings in the Ming and Qing, compass technology was continuously transmitted, later incorporating liquid damping and luminous graduations, and remains a backup navigational instrument today.