locator beacon

例句：

1. 1. The locator beacon is used to guide ships in the dark.
   定位信标用于在黑暗中引导船只。
2. 2.The locator beacon was a critical part of the navigation system.
   定位信标是导航系统的关键部分。
3. 3. The locator beacon helped to ensure safe passage for all vessels.
   定位信标确保所有船只的安全通行。