The Long Range Acoustic Device: pirate deterrent, crowd controller or soft drink seller?

When Somali pirates armed with RPGs attacked the luxury cruise ship Seaborn Spirit in November 2005 it wasn't armed troops or the threat of artillery that deterred the attack, it was sound waves. The ship was fitted with a clever bit of tech called the Long Range Acoustic Device (LRAD), a system which can emit painfully loud sound frequencies that are concentrated in a narrow beam and easily direct them at a target, not unlike using a spotlight. LRAD was originally developed for enforcing safe zones around US military vessel, but as Gizmag's David Greig learns, the potential applications of the sometimes controversial technology go well beyond protecting assets on the water.

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