"Maule Driver" wrote in message
om...

Heck, you don't even know if his Mode C was correct.


Yes, as I stated in an earlier message.



On 2 occassions , in that same general vicinity, my Mode C was showing the
wrong altitude by about 6,000 feet! Why? Transponder problem? I guess
so,
but it only happened one other time in one other place and hasn't happened
again.


A couple of years ago we had a guy flying through GRB approach airspace that
always had bad Mode C. But it was only bad with GRB approach, no other
facility had a problem with it. He had it checked at an avionics shop and
they found nothing wrong.