The original point was to let
people know the place has shoaled at its two entrances.

really? it seemed, after a bit, the point was to get some more beer drinking
frat boys in your "special" anchorage.

If someone wanted a secure anchorage, they would go in Cold Spring Harbor, turn
right and go in Oyster bay to anchor to the east of the mooring field, or more
often in West Harbor. The northwest corner of Oyster Bay had a nifty lobster
shack.