Is it still in practice?
I find no translation for skivvy wavers? What does skivvy mean?
I have forgotten it all now, but back then I could signal fluently. Learning to read was more difficult, since I had no partner signalling. I used illustrations from books, copied pages, cut the lines out and arranged them randomly. Later I had a primitive program vor VC-20 that randomly generated the angles for the letters. I had to type the code in by hand, three pages from some related Commodore-magazine, or booklet. It was not funny. Already back then I excelled in creating typos... And then in Basic code... Nightmare...