Long-range acoustic device
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A long-range acoustic device, acoustic hailing device, or sound cannon is a specialized loudspeaker and sound weapon that produces sound at high power for communicating at a distance. It has been used
An NYPD LRAD on top of a police humvee outside the 2004 Republican National Convention, hosted in Madison Square Garden in New York City
US Navy Ship with LRAD system aboard, 2010
An LRAD operator wearing hearing protection
An NYPD officer stands ready with the LRAD 500X at an Occupy Wall Street protest on November 17, 2011, near the city hall.
Piracy
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Piracy is an act of robbery or criminal violence by ship or boat-borne attackers upon another ship or a coastal area, typically intending to steal cargo and valuable goods, or take hostages. Those who
Long-range acoustic device
…high decibel capacity (up to 160 dB measured at one meter from the device). Other uses have included for negotiations in siege situations; to deal with piracy at sea; for mass notification during natural disasters or other emergencies; and by the military, including several navies. Acoustic hailing devices…
A mosaic of a Roman trireme in Tunisia
A fleet of Vikings, painted mid-12th century
The Vitalienbrüder. Piracy became endemic in the Baltic Sea in the Middle Ages because of the Victual Brothers.
Cossacks of Azov fighting a Turk ship by Grigory Gagarin