Meng Xi talks about where the compass is.

Compass has been widely used in aviation, navigation, mining, exploration, geodesy, tourism and military fields. When the compass was first invented, it was used for ritual, etiquette, military affairs and divination to determine the orientation when looking at Feng Shui.

When it was first invented, the compass was used for sacrifice, etiquette, military affairs, divination and geomantic omen. Compass is one of the four great inventions in ancient China.