Say What?

Never assume others have a radio, or are on the same frequency.  Also, they may have no time to talk, nor wish to.  We should limit the time and energy spent on needless chatter.  Leaving a frequency open for more important messages also prevents our distracting other pilots.  (Incidentally, although the two-click answer for "affirmative" is brief, no one ever knows for sure if thats really what it was – or even who it was from, or for.  The proper affirmative response is "ROGER".)Even after prior arrangements have been made or radio contact established, it's wise to assume at first that other pilots still do not see you.  By itself, even a head turned in your direction is no assurance of visual contact, but a face turned toward you followed by a wave is about as good as a handshake.  A wave is most effective with palm open ninety degrees to the line of flight so it's easy to see, the hand moving fore and aft, leaving no question about its meaning. Any wave offered should be instantly returned.  If not, keep your distance!  Furthermore, recognition only counts the moment it's received, not one circle or one minute later.