Magnetic Compass

Used by sailors to find direction even when the sky was cloudy. It was often made from a lodestone or magnetized needle floating on water.

Developed during the Song Dynasty.

It helped ships travel far distances safely, boosted trade across Asia, and made long sea voyages more reliable.

What: A tool using a magnetized needle to indicate direction.
Who benefited: Sailors, traders, and explorers for navigation.
When: First used during the Han Dynasty, perfected by the Song (960–1279 CE).
Why it was important: It revolutionized navigation, enabling long-distance maritime trade.