The Dinka Marquis is a sailboat with one of the broadest histories in the series, appearing from Grand Theft Auto: Vice City through GTA V and Online, and it is due to appear in Grand Theft Auto VI. It can be seen on Leonida's waters in the first trailer, in the Vice City and Leonida Keys postcards on the promotional website, and stored on land next to Jason Duval's home.
Vehicle data via GTA Wiki (Fandom), CC BY-SA 3.0.