"Don Byrer" wrote in message
...

Also need to know the profile of the pilots who have not answered the
questions. Are they (we) different from those that have?

hmm...are they so introverted that they won't respond...or so
obnoxious that they wouldn't?

Ultralight pilots that can't hear you and guys who don't use radios. I'd
recommend trying light signals, but, they may still be using monochrome
displays.

Or they missed the survey, like me, and only saw the replies.

-c