OK, Fred ... how did we get there? Well, the question was about beaching boats -- now to you New Englanders, you just drive up on the beach and when she stops you drop the hook. Others of us, living elsewhere, often gueeeesh through mud and gunk before we come to a stop, and then when we drop the hook she goes down 30 or 40 feet, and never hooks -- just oooozes to a stop.
It's all the fault of geology -- you nor'easters have good gravel and tough sand washed off the bedrock of New England. The rest of the east coast south of you gets the fine stuff winnowed out of your beaches and carried south by longshore currents; the Gulf coast is often squishy with glacial outwash filtered out by the long Miss so nothing but mud gets to the sea, and many interior lakes and rivers have glacial goo (otherwise known, at least in the s.w., as quicksand). So when Yankees jump overboard out of their native habitat (yep, there is something on the other side of the Hudson River) and they land on the 'beach' they often sink up to their chins! No comment, Yankee!! And it is a safety thing to know how to get out of goo if you are a poor misplaced New Englander.
So, now you can ask how beaching boats gets to a geology chat ... Best regard, ol' buddy El and Bill