[Paddlewise] Tides & Currents

I was struck by the number of times tidal currents played a role in the
accidents in the book Deep Trouble.  The term 'swept out to sea' stirs up
some pretty scary images but how bad can it really be?  Given that a person
can stay in the boat, how far out can they be swept?  A mile, two miles?
Even at full ebb, the tidal (not ocean) current has to dissipate somewhere.

Granted one might well spend some uncomfortable hours and then have to
paddle back, but still......
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