Dave S writes:

You know nothing of the technical standards regarding TCAS, nor the
operational requirements of using one.

I know that TCAS displays are mediocre in azimuth, and that their accuracy in
this respect depends hugely on the design of the hardware on the local
aircraft (since it must depend essentially on radar sweeps to determine
azimuth). Distance is more reliable. Altitude depends on the accuracy of the
remote transponder.

TCAS is not the only traffic display device out there.

What other ones are there, and how do they work?