中国古代四大发明之一就是指南针。

Zhōngguó gǔdài sì dà fāmíng zhī yī jiùshì zhǐnánzhēn.

One of the Four Great Inventions of ancient China is the compass.

他拿出指南针，确定了前进的方向。

Tā ná chū zhǐnánzhēn, quèdìng le qiánjìn de fāngxiàng.

He took out a compass and determined the direction to go.

没有地图和指南针，在森林里很容易迷路。

Méiyǒu dìtú hé zhǐnánzhēn, zài sēnlín lǐ hěn róngyì mílù.

Without a map and a compass, it's easy to get lost in the forest.