Thanks perusal for you tail covering response. I fly, on average, 5 times a day from a flying school close to Class D airspace and underneath a variety of Class D/E TMA. I could probably tell you which particular tree is inside/outside the various bits of CAS. We also have the luxury of immediately recognisable callsigns. Nevertheless, ATC always tell us to remain clear of CAS as we depart our ATZ away from their CTR/CTA. For example:
"XXX radar, C/S request Basic Service"
"C/S, XXX Radar, remain clear of CAS, pass your details"
"C/S, C172 from EG** to EG** not above 2000ft routing ..... remaining clear of CAS request basic service"
"C/S, XXX QNH 1010, Basic Service not above 2000ft, remain clear of CAS"
Now the HF element of me thinks that the efficacy of such a statement is negated if used in almost every single transmission regardless of it's relevance.
PS. I trust I don't sound like an 'idiot' on the R/T.
