Compass Navigation at Sea

Timeline

1. c. 1040–1127Quanzhou–Guangzhou maritime trade ports · Southeast coastSong dynasty sea vessels carried water-floating compasses; Zhu Yu's Pingzhou Table Talk records merchants observing stars at night, the sun by day, and the compass in cloudy weather, marking the magnetic needle's shift from land surveying to practical navigation.
2. c. 1187–1260Arab Sea–Indian Ocean routes · Indian OceanMagnetic needle navigation knowledge spread to West Asia and North Africa through Song–Yuan maritime trade and Arab merchant networks; Arab texts called it the 'sea needle', laying technical and intellectual foundations for the Mediterranean world to adopt the compass.
3. c. 1291–1300Mediterranean ports · MediterraneanMerchant ships of Venice, Genoa, and other city-states widely equipped compass boxes and bearing dials, combined with charts and port routes, making orientation possible on winter overcast days and night voyages, directly supporting Mediterranean–Atlantic trade expansion at the end of the 13th century.
4. c. 1400Ports of the Iberian Peninsula · Iberian PeninsulaFrom the 15th century the compass was used with quadrants and astronomical navigation, driving transatlantic voyages; subsequent innovations such as magnetic declination correction and liquid-filled compasses continued until modern satellite navigation replaced the magnetic needle as the primary tool.