Third Line of Defense - By now your would be thieves are closing in or possibly have already boarded your boat. They are not easily spooked and mean business. So shoot them with the flare gun, aka the ending of Dead Calm where Billy Zane gets tagged with a flare. For really close combat we also have the fishing gaff, a 6 foot long pole with a huge rusty metal hook. If we can pull in a monster tuna I’m sure we could hook a pirate.