Navy AUV sets record

The Naval Research Laboratory's Acoustics Division, with Bluefin Robotics, set a record 315-mile long-endurance autonomous research mission using Reliant, a heavyweight-class mine countermeasures underwater vehicle (AUV). Reliant, when equipped with a low frequency broadband sonar system, is the prototype for the new U.S. Navy Knifefish mine-hunter. The 20 foot long, 1,350 pound AUV left Boston Harbor and traveled south past Cape Cod, then west through Nantucket Sound between Martha’s Vineyard and the mainland, then south of Long Island to the approaches to New York City. It traveled at a depth of 10 meters and an average speed of 2.5 knots. The vehicle surfaced at 20-kilometer intervals to report position via Iridium satellite and made Upper New York Bay with a 10 percent energy reserve. The system is designed to help the Navy detect and identify undersea volume and bottom mines in high-clutter environments. The Knifefish system is a part of the Littoral Combat Ship mine countermeasure mission package. (Source: Business Wire, 11/20/13) Note: Stennis Space Center, Miss., is home of an NRL detachment, the Naval Oceanography Mine Warfare Center and the Naval Oceanographic Office, which operates a fleet of unmanned underwater vehicles; A variant of the Littoral Combat Ship is built by Austal, USA in Mobile, Ala.; The Naval Surface Warfare Center Panama City (Fla.) Division conducts RDT&E in technologies for warfare in littoral regions, including mine warfare systems and mines.