Avoiding Action.
Appreciate that's what CAP493 says, I am instigating that it is old fashioned and out of date, especially with the advent of Mode S and BDS6 compliant.
Wingo.
That may well be the case, but surely it takes the pilot about 2-3 seconds to hit the ident button, and the controller should be concentrating on the call in hand, i.e. if he asks for SQ ident then he'll already be looking at our radar tag. If someone else calls he can still have his eyes on our tag even if a new call is ½ way through it's check-in call etc.
Chesty
Because the controller's tag already shows our callsign, a/c type, squawk code, groundspeed, altitude etc etc. Just because we read it back it doesn't make the controller notice where we are. What makes the controller know where we are is the fact that he already has a mental picture of the traffic in his sector, he already knows we are there, and he can see the a/c tag flash when it idents. It doesn't need us to read back "SQ Ident Speedy123"