[Paddlewise] Whistle Signals

I recently read with interest the Tsunami Rangers system of hand signals for 
communicating kayak to kayak.

I also notice that river rafters refer to a necessary peice of gear as a 
"river whistle".

Sea Kayakers refer to it as a "astorm whistle".

No matter, but does anybody know of a series of "whistle signals" that could 
be used similar to the Tsunami Rangers hand signals to communicate?

Or do you just blast on the danged thing hoping somebody will heaar you and 
think it is halftime?

John LeBlanc
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