[I'm goin' down]

Once the emblem is on the conning tower it stays there until replaced (by you). Gunfighter might make you a custom emblem if you request a special favor.

In the Killflags thread they make emblems for specific boats, but that site is down. If you want to make your own emblems that is a different issue. I prefer to sail and not spend time creating grahpics, especially since I do not know how to do it or desire to learn. But who knows better than you what you prefer.