Somehow
DCL forgot about that law in 2012 when the Magic first sailed out of NYC. They offered several weekends over the summer of 2 night cruises to nowhere. My inner nerd loves the map channel so I watched it to see where we'd go. We went to approximately the same latitude as Virginia Beach and turned around.
It was only 2 nights but we're only a 90 min train ride to NYC so it was a breeze. It was fun to sail past the Statue of Liberty. It also gave me a chance to book another OBB.
Sure beats doing laundry half the weekend.