h a l f b a k e r yTempus fudge-it.
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A nice, simple Idea.
As an alternative, consider a device attached to a swimming suit,
to measure speed through the water.
Some swimming suits
https://www.google....YIg&ved=0CAYQ_AUoAQ
Just in case the subtitle wasn't clear enough. [Vernon, May 21 2015]
[link]
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