When will the compass be used in navigation?

Compasses were used at sea in the Song Dynasty and spread to Europe by Arabs. It is the basic need of mankind to start the "positioning" of the era of great navigation.

Even in the barbaric times when we went hunting in some places, we couldn't forget the way home. To identify the direction, we have to rely on our own sense of direction. The sun, the moon and the stars, the "Sina" used in ancient China, has become an important tool.

Sina, namely compass and compass, is widely recognized in modern times. Without them, there would be no era of great navigation in the west. Although no one knows who first put the equipment made of magnets on the ship, this kind of ship first appeared in the sea near Guangzhou.