compass transmitter

例句：

1. 1. This compass transmitter is very useful for navigation.
   这个罗盘发射器对于导航非常有用。
2. 2. The compass transmitter was a crucial part of the old mapmaking process.
   罗盘发射器是古老地图制作过程中一个至关重要的部分。
3. 3. The compass transmitter helped me find my way back to the campsite.
   罗盘发射器帮助我找到了回营地的路。