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T-AGS Survey Ships

Military Sealift Command's Special Missions program supports worldwide oceanographic programs with ships which perform acoustical, biological, physical and geophysical surveys. Ships such as USNS Silas Bent (TAGS 26), USNS Kane (TAGS 27) and USNS Bowditch (TAGS 62) gather data which provides much of the military's information on the ocean environment. Oceanographic and hydrographic survey ships are used to study the world's oceans. The collected data helps to improve technology in undersea warfare and enemy ship detection. The oceanographic and hydrographic survey ships' multibeam, wide-angle precision sonar systems make it possible to continuously chart a broad strip of ocean floor. Two oceanographic ships survey the sea bottom and collect hydrographic data, charting three-fourths of the world's coastlines. USNS John McDonnell (TAGS 51) and USNS Littlehales (TAGS 52) make it easier for navigators to find their way along well-traveled and not-so-familiar shipping routes.

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History

The USNS John McDonnell (TAGS 51) was laid down Aug. 3, 1989, and the USNS Littlehales (TAGS 52) on Oct. 25, 1989. The McDonnell launched Aug. 15, 1980, the Littlehales on Feb. 14, 1991. The contract for the Pathfinder class of surveying ships was awarded in January 1991 for two ships with an option for a third which was taken up May 29, 1992. A fourth ship was ordered in Oct. 1994 with an option for two more. A fifth ship was ordered Jan. 15, 1997.

Description

The Silas Bent class of surveying ships were designed specifically for surveying operations. They have a bow propulsion unit for precise maneuverability and station keeping. The John McDonnell class of survey ships carries 34-foot survey launches for data collection in coastal regions with depths between 10 and 600 m and in deep water to 4,000 m. A small diesel is used for propulsion at towing speeds of up to 6 knots. SIMRAD high-frequency active hull-mounted and side scan sonars are carried. The Pathfinder class of survey ships have three multipurpose cranes and five winches plus a variety of oceanographic equipment including multibeam echo-sounders, towed sonars and expendable sensors.