The pink-and-blue Shitzu Squalo from the Ultimate Edition is moored at Washington Beach. The boat is tied to fishing on Gambit Bay, and it has a crate of explosives on board.
The full line: the Squalo is a 'gradient pink and blue Squalo docked at Washington Beach,' made 'open-ocean-ready with an explosives-laden weapons crate.'
Washington Beach is a returning name. It was a district of Vice City in the 2002 game Grand Theft Auto: Vice City. Fan maps place it in Vice City again, but Rockstar has not confirmed that.