GTA Vice City
The Yacht is owned by Juan Cortez, and is featured in all the missions Tommy Vercetti does for him. In the mission All Hands On Deck, Tommy must defend the boat from the attacking GIGN and DGSE agents. You can enter the Yacht using a helicopter, land it next to the boat and then jump on the Yacht.
The Ballad of Gay Tony
The yacht appearing in TBOGT is owned by criminal Frickie Van Hardenburg. During the events of the game Luis Fernando Lopez is ordered by Yusuf Amir to steal the Buzzard helicopter off the boat and destroy it. This time, the Yacht is larger and has a helipad. Unlike in GTA Vice City, you can now enter it.
The boat can be driven with the use of mods, and it makes a cameo in GTA V in the movie Meltdown.
Grand Theft Auto V
Michael De Santa is told by Jimmy that Tracey is hanging out with porn actors and go stop them, just to get Tracey home. In Grand Theft Auto Online, the Dignity reappears as the location of a heist preparation mission, being owned by the Vagos.