beam compass

例句：

1. 1.He used a beam compass to find his way back to the campsite.
   他使用光束指南针找到了返回营地的路。
2. 2.The engineer used a beam compass to measure the angle of the building.
   工程师使用光束指南针测量了建筑物的角度。
3. 3. The pilot used a beam compass to guide the plane back to the runway.
   飞行员使用光束指南针引导飞机返回跑道。