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ACR definitely looks like a company I should add to my list. Their combo of mirror and whistle looks great(I guess this is what you described, Nomad - http://www.acrelectronics.com/hotshot/hotshot.html ). It has also a cylindrical float so it doesn´t sink.


Yes that is the one I recommend. Also, consider the tone of the whistle as well as its volume. Older folks have a hard time hearing the high pitched ones. We tried several with a group of folks and many could not easily hear the high pitched, but louder whistles.
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...........From Nomad.........Been "on the road" since '97