Gak-Sixtoo functioned as a nav droid under the employ of the Hutt named Bokku, and was stationed on Bokku's personal barge. Gak-Sixtoo piloted the vessel when Bokku led the Sith Lord Darth Vader along with the Sith assassin Ochi to Zee-Nine City Seven with the intention of finding the carbonite encased smuggler known as Han Solo, and during this time, Gak-Sixtoo spoke with Ochi as he and Vader left the ship.