Thanks bose-x, I was just thinking the same. Legal height is legal height period. There are a few controllers who have criticised pilots for flying "too close" to CAS in the past and should know better. Now on a similar vein what is your response to a controller who cannot offer a service but wants you to squawk for "indentification purposes" when you are clearly o/s but close to a CAS boundary? What is the benefit to either party?