I, too, will let Fabio Guzman give the legal answer, but based on what I learned during years of living aboard in Samana, anyone who brings in a vessel for commercial purposes must flag the vessel in the Dominican Republic. There seems to be some difference in how much this actually costs, depending on how well connected you are, but you are wise to be looking into this subject before bringing the vessel.
Looking at it from the standpoint of the Dominican Republic, if foreign owners were allowed to bring their vessels to the Dominican Republic to conduct excursions, they would probably soon put Dominican boat owners out of business. That will not be allowed to happen.
Several years ago on one of the other islands of the Caribbean there was a great deal of trouble because the playing field for foreign vessel owners was pretty much on a par with the local owners. When the locals started being squeezed out, the foreign owners started having explosions, etc., that destroyed their boats. There are now laws that give better protection to the foriegn owners there.
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