The answers would demand on:
Where is the boat registered? Flagged? Titled? In who's name, the deceased?
Depending on jurisdictions, in order to sell it the title/registration may not be able to be "simply" transferred, but either executed by the estate (probably requiring a lawyer/notary/etc) or transferred to someone else who can then effect a simpler transfer.
You need to find out the legalities of the ownership, and the governing venue. And then move forward from there. If the market for boats of that type is slow and poor in the DR, then you would probably be better off putting on a crew and sailing it to a better market, where a broker could take care of the entire process--once he was given the correct paperwork to enable that.
So, what are the particulars of the boat, and all that paperwork?