[QUOTE=IO540]
My experience is that some PPLs I have met havent got the faintest clue about what class A or class D airspace means or what it looks like on a half mil chart That is hard to believe. The airspace is labelled, with clear numbers. QUOTE]
Hard to believe for you maybe IO540, but I can asure you that this is the case.
Example:
When asked to plan a NAV trip from A to B, these students will plot a line right through class A airspace or base of an airway and they dont realise what they've done, they dont even think its illegal to do this when asked!!
Whats even more worrying is that some GA pilots Ive flown with think its quite acceptable to fly into cloud whilst VFR, below MSA and in hilly terrain.