I entirely agree, Miserlou. I often fly without the radio, and always rock my wings on meeting other aircraft. It is a shame when people do not respond. Sometimes I think they have not seen me. Other times, I lament the fact that some products of PPL schools appear to be afraid to bank more than twenty degrees. Sometimes,I wonder if they are just flying on, having seen me, but assuming that they have right of way because their GPS (aka PIC) tells them so, and that my wing-rocking is a panicky "get me out of here" manouevre, rather than a way of saying "I see you, and hello, fellow pilot" . Bah, humbug.