Swimming for Scientists

I stumbled upon this post by the Mathlete about how to perfectly swim across the Bay. The math is way over my head, but this I understood: 

The race is usually timed so that the majority of racers will start out with a bit of tidal current pushing them north, swim the majority of the race during the wonderful still water of slack tide (when the tide is changing directions) and finish as the tide starts to go out, creating a current pulling swimmers south. 

So I'm adding it to my collection of Bay Swim knowledge.