Dick, when I was doing charters out of Kal, and FSO'ing as well, I often got, and gave, traffic 'numeri'.
The mining industry was 'big' then, = lots of aircraft going which/that way.
I used to jot down the callsigns only, and 'imagine' in my mind where they were in relation to me.
'Get the picture' so to speak.
If they were 'well in front, and expected to be on the ground or 'gone' before I posed a potential conflict, I simply kept an 'ear open' for their next call.
If I was going to overtake a slower aircraft, I would sight him/her and call that I was.
If I heard the FK.28 right up my clacker, I got out of his way very quickly, usually by descending, at one time to 500AGL, 'cause he doesn't.
T'ain't really 'rocket science', and its 'heads up' all the way, usually with some 'humour' on the R/T - we all knew each other, sort of, and 'common sense' (Airmanship....Dare I say it??) prevailed..
Anyway, regardless of what 'they' do now, it worked then and I'm still alive....
All of these 'problems - must be a 'modern generation' thing......
Sorry to be so 'obvious' to all, but you did ask....
Cheers
And, thanks again.......