NOAAS Mount Mitchell

For the Coast and Geodetic survey launch Mitchell of 1919-1944, see USC&GS Mitchell.

NOAAS Mount Mitchell (S 222) before renovation
History
United States
Name	USC&GS Mount Mitchell (MSS 22)
Namesake	Mount Mitchell in North Carolina
Builder	Aerojet-General Shipyards, Jacksonville, Florida
Launched	29 November 1966
Commissioned	23 March 1968
Fate	Transferred to National Oceanic and Atmospheric Administration 3 October 1970
United States
Name	NOAAS Mount Mitchell (S 222)
Namesake	Previous name retained
Acquired	Transferred from U.S. Coast and Geodetic Survey 3 October 1970
Decommissioned	1995
Stricken	1995
Homeport	Norfolk, Virginia
Fate	Sold 2001
United States
Name	R/V Mt. Mitchell
Namesake	Abbreviated version of previous name
Owner	Mount Mitchell LLC
Operator	Global Seas LLC
Acquired	Purchased 2001
In service	2003
Homeport	Seattle, Washington
Status	Active
General characteristics (U.S. Government service)
Class and type	Fairweather-class hydrographic survey ship
Tonnage	1,591 gross register tons 578 net register tons
Displacement	1,800 tons
Length	70.4 m (231 ft)
Beam	12.8 m (42 ft) moulded
Draft	4.4 m (14 ft) maximum
Installed power	2,400 shaft horsepower (3.2 megawatts)
Propulsion	Two 1,200 hp (0.89 MW) General Motors geared diesel engines, 2 shafts, 107,000 US gallons (410,000 L) fuel; one 200 hp (0.15 MW) Detroit Diesel/Bird Johnson geared through-hull bow thruster
Speed	12 to 12.5 knots (22.2 to 23.2 km/h) (cruising)
Range	5,898 nautical miles (10,923 km)
Endurance	22 days
Boats & landing craft carried	Three or four 8.8 m (29 ft) survey launches, two motor whaleboats, three Boston Whaler utility boats
Complement	49 (10 NOAA Corps officers, 4 licensed engineers, and 35 other crew members), plus up to 4 scientists
Notes	Ice-strengthened hull; 300 kilowatts electrical power plus 75-kilowatt emergency generator

NOAAS Mount Mitchell (S 222) was an American survey vessel in commission in the National Oceanic and Atmospheric Administration from 1970 to 1995. Prior to her NOAA career, she was in commission in the United States Coast and Geodetic Survey as USC&GS Mount Mitchell (MSS 22) from 1968 to 1970. In 2003, she returned to service as the private research ship R/V Mt. Mitchell.

Construction and commissioning

Mount Mitchell was built for the U.S. Coast and Geodetic Survey as a "medium survey ship" (MSS) at the Aerojet-General Shipyards in Jacksonville, Florida. Launched on 29 November 1966, she was commissioned into the Coast and Geodetic Survey in March 1968 as USC&GS Mount Mitchell (MSS 22). When the Survey merged with other organizations to form NOAA in 1970, she became part of the NOAA fleet as NOAAS Mount Mitchell (S 222). She is the sister ship of NOAAS Fairweather (S 220) and NOAAS Rainier (S 221), which are both still in service with NOAA.

USC&GS and NOAAS Mount Mitchell, 1968 - 1995

Mount Mitchell operated as a multipurpose vessel. She had an oceanographic laboratory, several echosounders, and an oceanographic winch. She also had a hydroplot data-processing system, as did two of her survey launches.

Mount Mitchell conducted hydrographic surveys on the United States East Coast and in the Caribbean, and served as an oceanographic vessel throughout much of the North Atlantic Ocean on various projects. In the late 1980s she was fitted with a multi-beam sounding system for hydrographic work related to establishing the maritime exclusive economic zone of the United States and discovered Mitchell Dome among other large, economically significant undersea features in the Gulf of Mexico. In 1992 she proceeded to the Persian Gulf to study the effects of the 1990-1991 Persian Gulf War oil spills into the Gulf. After returning to the United States, she resumed operations as a hydrographic survey vessel until decommissioning in 1995.

R/V Mt. Mitchell, 2001 - Present

After six years of inactivity, the decommissioned Mount Mitchell was purchased in 2001 by Mt. Mitchell LLC and was completely refurbished and retrofitted with the latest in electronics, machinery, and safety equipment. With her refit complete, she arrived in Seattle, Washington, in 2003 to begin her career as the private research ship R/V Mt. Mitchell. She is managed and operated by Global Seas LLC, headquartered in Seattle.

In 2008, Mt. Mitchell was outfitted with the most advanced underwater mapping equipment available. Her Kongsberg EM 120 and EM 710 High-Resolution Multibeam Mapping Systems offer a state-of-the-art capability to perform seabed mapping to full ocean depth with unrivaled resolution, coverage and accuracy. The EM 120 system allows for accurate surveys to a depth of 11,000 meters (36,089 feet), while the EM 710 allows for accurate mapping to a depoth of 2,000 meters (6,562 feet). The vessel is an acoustically quiet platform capable of supporting sophisticated sonar operations in deep water and high sea states. To ensure ship-related noise does not degrade the capability of the vessel to perform its science mission at full performance, the sonar systems are installed in a gondola arrangement below the ship's hull. In addition, custom designed propellers were installed in early 2011 to improve the vessel's efficiency.

In 2008, Mt. Mitchell was outfitted with stabilization tanks and anti-roll chocks which have eliminated much of her natural roll, making hert an ideal platform for surveying. Mt. Mitchell is a very quiet vessel in comparison to other commercial research platforms and performance and acoustical testing of the EM 710 sonar demonstrated that it is identical to that obtained on the quietest United States Navy research vessels.

Mt. Mitchell also operates two launches, R/V Mt. Augustine and R/V Mt. Shishaldin. For shallow-water surveying, Mt. Augustine is a 32-foot (9.75-meter) Silver Streak cuddy-cabin twin-diesel craft outfitted with a multibeam sidescan sonar mount and laboratory space that Mt. Mitchell launches and retrieves through a Vestdavit system. Mt. Shishaldin is a 25-foot (7.6-meter) landing craft that can seat six people and has a drop-down bow for landing on remote beaches; it can be used for ferrying people between ship and shore, tide gauging, and hauling all-terrain vehicles.

References

• Prézelin, Bernard, and A. D. Baker III, eds. The Naval Institute Guide to Combat Fleets of the World 1990/1991: Their Ships, Aircraft, and Armament. Annapolis, Maryland: United States Naval Institute, 1990. ISBN 0-87021-250-8.
• NOAA History, A Science Odyssey: Tools of the Trade: Coast and Geodetic Survey Ships: Mt. Mitchell

External links

• "R/V Mt. Mitchell". 14 Nov 2011. Retrieved 14 Nov 2011.