Cub Driver wrote:
On Sat, 07 May 2005 20:48:12 GMT, "Steven P. McNicoll"
wrote:


Correct, unless otherwise indicated. Some control zones require Mode C.


We don't have control zones in the US, haven't had them for almost twelve
years now. When we did have them none of them required Mode C.


Well, we have Mode C zones! There's a big ring around Boston that I
generally avoid, though I am legal to fly through it without a
transponder.

The Mode C veil existed at the same time control zones existed. When
the airspace was "alphabetized" the term control zone was deleted in
lieu of the term "surface area of controlled airspace designated for
an airport" (which is pretty close to the old definition of the control
zone with a lot of the flaky differences removed).