The BTN Delmar is a boat new to the series. Rockstar first showed it in Trailer 1 (0:23).
Image: Rockstar GamesAirboat 09
First shown: Official Screenshot: Grassrivers 01 & 03
Dinghy
The Dinghy is a Nagasaki boat returning from earlier GTA games.
Image: Rockstar GamesKayak
First shown: Rockstar media: Ultimate Edition (Jason's safehouse)
Marquis
The Marquis is a boat returning from earlier GTA games.