Can't give you a definitive answer, however....
60 feet is not a criteria for a license in the US, though it could be other
places.
Insurance will play a big part as to who operates this vessel.
Where you register/document it will also be a major factor (amazin what you can
get away with when you have enough money and the right contacts)
BUT, if you can afford a ship that big, why would you want the headaches
associated with being the Master of such a vessel? Hire some flunky.

Shen