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The stay at the marina was great.  The booking experience with Dockwa was not.  Dockwa collected the 3 nights slip fee from me, but the marina had no idea that anything other than the initial night has been collected so they charged me (and effectively double-charged me).  Now I have to work to get the money back.  Summary - I will definitely go to Onancock again but I won't use Dockwa to do it.