How to trace which walkie-talkie makes sound?

If you want to check, you need to use a radio locator to make radio orientation when the other party launches, so as to measure the position and distance of the other party. If the other party stops before the orientation is completed, it may never be found again. Moreover, this directional machine is very expensive, and it is really unnecessary to import hundreds of thousands of yuan. At ordinary times, we can only give priority to strengthening education, or divide this 100 machine into 5 ~ 10 groups, and don't run with a unified frequency, so that even if something goes wrong, we can roughly judge who it is.