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TCAS shows nearby aircraft on a map. It generates a Traffic Alert (TA) to warn of nearby aircraft when certain parameters are met. If they get closer then it generates a Resolution Advisory (RA) which gives climb/descend instructions to avoid a collision. RAs are disabled below 1000 feet.

So there's already tracking on a map that's available to the pilots. During landing, pilots are looking outside and not glued to their instruments.

The real issue is trying to cram too much aircraft in such a small space and time.

I believe it’s turned off when below a certain altitude

This article has a good explanation of TCAS limits.

https://www.twz.com/news-features/heres-what-air-traffic-col...

Yeah, so similar to what I said, the transponder didn't work with that system as that article speculates the UH-60 didn't have it. My suggestion was that you could display what ATC has, hence the data distribution part of my comment. But I guess we could just accept what the article tells us that it would be too dangerous to display that info at lower altitudes and allow pilots to make the call and that we just have to live with these incidents then...