Via The Coming Anarchy, who notes the Pirate Safe Water Cannon pushes four times more gallons per minute than similar firefighter equipment. A commenter there notes that a minute or two would probably be enough to sink most Somali pirate boats.
These water cannons are also seriously high tech.
Radio Remote Control – capable of controlling all cannons “on the run”
Marine Small Target Tracker (MSTT) by Raytheon Anschütz, integrated with your
vessel’s existing radar to detect pirates long before they arrive.Chemical Additives – e.g., foam for increased fighting power, slippery foam, dyes, etc.
Lights, Camera, Action! Add flood & spot lights, and other peripherals, all controlled from the UCS station
Long Range Acoustic Devices (LRAD) and other innovative, third-party systems can be easily integrated with, and controlled by, the UCS station.
Better than actual guns though… Sinking a ship or two would probably stop the attacks for a while, until they figure out how to defend against it. And would probably result in less deaths than keeping AK47’s on board.