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Xavier,
You wrote:-
>I am looking for anyone providing information about U/W
>signs which are :
>
>1) not standard (e.g not like out of air)
>2) are easy to make
>3) are easy to understand
>4) are practical to use.
>
>I am also interested in "contact signs" when visibility
>is absolute zero.
>
>The signs should be "natural" meaning no learning and
>universal understandable.
I don't know what you mean by, ""natural" meaning no learning" but how about
line-signals which can be adapted to tactile [hand squeezing] or audio use.
Signals made with a line are of two types: The PULL - a long, steady and
very distinct tug on the line, and the BELL - a short, sharp pull with the
same timing and sequence as that of striking a ship's bell { ie. 5 bells =
Ding-Ding. Ding-Ding. Ding.) The beauty of line signals is that not only
are they universally recognised and easy to learn - and remember - but they
can be readily adapted to underwater sound communication, either between
surface and diver or diver to diver, by simply tapping 'Pulls and Bells' on
suitable metal objects beneath the surface.
Hope this helps
David
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