As a point of information, the Coast Guard, whose responsibilty it is to set standards by which boats are built, does not specify any flotation requirements boats twenty feet in length or longer.
I am not saying none will, but it would be a risky assumption for anyone in a boat twenty feet long or longer to assume that the boat will remain afloat as it will, most likely, not.
Our part time marine patrol officers should be aware of this fact.
http://www.uscgboating.org/safety/bo...on/183-101.htm
http://www.uscgboating.org/safety/bo...on/183-201.htm