Scally, from Ultima V: Lazarus
Meeting him in Ultima V, Scally showed himself to be quite convinced of his own skill. In his songs, he spoke of a former pirate named David. Asking about him, the Avatar learned that David, besides being nasty, also had invented a tool for navigating the seas: the Sextant. Sadly, Scally had no idea, where David now was, speculating him to be keeper of a Lighthouse.
With this information, it was possible to go to Greyhaven and get the Sextant from David.