"Hornigold's ship." he answers, but it's said with the sort of pride that suggests he considers it his own as well. He lived aboard it after all, a favored member of Hornigold's crew.

There are only a few reasons one might ask such a question. They aren't in the sort of port that would require anonymity, or otherwise Ed wouldn't have answered at all. The other man could be a pirate hunter, but Ed had grown fairly competent in his swordplay- he could take on one man. If he was a hunter it was foolish of him to come alone, and any other men on board would quickly jump to Ed's side for reinforcements. No, this was a man looking for work, staking out prospects, or at the very least a man on the run. Ed knows the type because he's been there before.

"What's it to you?"