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8 September 2009 http://en.wikipedia.org/wiki/Deperming Deperming is a procedure for erasing the permanent magnetism from ships and submarines to camouflage them against magnetic detection vessels and enemy marine mines. A sea-going metal-hulled ship or submarine, by its very nature, develops a magnetic signature as it travels due to a magneto-mechanical interaction with the Earth's magnetic field. This signature can be exploited by magnetic mines, or facilitate the detection of a submarine by ships or aircraft with magnetic anomaly detection (MAD) equipment. Navies use the deperming procedure, in conjunction with degaussing, as a countermeasure against this. Specialized deperming facilities, such as the United States Navy's Lambert's Point Deperming Station are used to perform the procedure. Heavy gauge copper cables are wrapped around the hull and superstructure of the vessel, and very high electrical currents (as high as 4000 amps) are pulsed through the cables. This has the effect of "resetting" the ship's magnetic signature. It is also possible to assign a specific signature that is best suited to the particular area of the world the ship will operate in. Over time the deperm will begin to degrade and the procedure must be redone periodically to maintain the desired effect. __________ Related: deperm-eyeball.htm Submarine Magnetic Silencing Facilities August 18, 2006 RELEASE No. 690-09 September 08, 2009 Navy Announces Decision on Norfolk Harbor Channel Dredging The Navy announced today its decision to deepen approximately five miles of the Norfolk Harbor Channel in the Elizabeth River. This action will allow the continuous safe and expeditious travel of aircraft carriers to and from the Norfolk Naval Shipyard (NNSY) and the Lamberts Point Deperming Station. Dredging this heavily-used waterway, which is the federal navigation channel within the Elizabeth River in Norfolk, Portsmouth, and Chesapeake, would occur from the Lamberts Point Deperming Station in the Lamberts Bend Reach, south to NNSY in the Lower Reach. Dredging would occur completely within the existing Army Corps of Engineers-maintained federal navigation channel. The action is necessary because currently there is not enough space between the keel of transiting aircraft carriers and the bottom of the channel. This causes mud and other debris from the river bottom to be drawn into the engine cooling and firefighting systems, creating the potential for engine damage, costly delays, and unsafe conditions. To avoid these conditions, aircraft carrier movements into and out of the deperming station and NNSY are now limited to high tide periods. These conditions must be alleviated in order for the Navy to meet the requirement of maintaining the combat readiness of its nuclear-powered aircraft carriers, and effectively and efficiently perform its national defense mission. The Navy's decision conforms to the process outlined in the National Environmental Protection Act, which requires analysis of the environmental consequences of federal actions. The Navy consulted with state and federal regulatory agencies throughout the environmental impact statement (EIS) process, including the U.S. Fish and Wildlife Service, the National Marine Fisheries Service, the Virginia Department of Environmental Quality, and the Virginia Department of Historic Resources. The U.S. Army Corps of Engineers was a cooperating agency in this EIS. The record of decision is available on the project Web site at http://www.norfolkdredgingeis.com . For further information, contact Navy Public Affairs at 703-697-5342.

Navy Lamberts Point Deperming Station Eyeball

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http://www.bing.com/maps/default.aspx?v=2&FORM=LMLTCP&cp=q4b26q8n52bv&style=b&lvl=1&tilt=-90&dir=0&alt=-1000&phx=0&phy=0&phscl=1&scene=33537791&encType=1 Looking East

Looking West

An overhead aerial view of the Navy's deperming station near Norfolk. The guided missile destroyer USS RAMAGE (DDG-61) is inside the station being depermed. This is a process to neutralize the magnetic field put out by a metal warship to eliminate the danger of magnetic influence mines. Photographer's Name: Robert J. Sitar Location: Elizabeth River Date Shot: 10/23/1995 Date Posted: unknown

A bow-on view of the amphibious assault ship USS WASP (LHD-1) in the deperming station crib outside Norfolk. The WASP, a new ship, is being depermed for the first time. This is a periodic requirement done by wrapping the ship in electric cables to run electrical currents back and forth until the ship has a negative polarity. This prevents the ship from detonating magnetic influence mines or torpedoes. Photographer's Name: PH1 Westfall Location: Elizabeth River Date Shot: 8/25/1992 Date Posted: unknown

Aerial starboard side view of the amphibious assault ship USS WASP (LHD-1) inside the deperming station crib outside Norfolk. The WASP, a new ship, is being depermed for the first time. This is a periodic requirement done by wrapping the ship in electric cables to run electrical currents back and forth until the ship has a negative polarity. This prevents the ship from detonating magnetic influence mines or torpedoes. Photographer's Name: PH1 Westfall Location: Elizabeth River Date Shot: 8/25/1992 Date Posted: unknown

Five days after its commissioning, the nuclear-powered aircraft carrier USS ABRAHAM LINCOLN (CVN-72) lies tied up at a deperming pier along the Elizabeth River. Wrapped vertically around the LINCOLN are cables that, when energized, will reduce the ship's permanent magnetism, thus helping to protect it from magnetic mines and torpedoes. Photographer's Name: PHAA David Dentry Location: unknown Date Shot: 11/16/1989 Date Posted: unknown

North Atlanic Ocean. An elevated bow view of the amphibious assault ship USS NASSAU (LHA 4) being assisted by large harbor tugs as it approaches Deperming Station No. 9. Photographer's Name: UNKNOWNLocation: NAVAL OPERATING BASE, NORFOLK Date Shot: 10/3/1983 Date Posted: unknown

An elevated starboard bow view of the nuclear-powered aircraft carrier USS DWIGHT D. EISENHOWER (CVN 69) being pushed out of a deperming crib by tugs. Photographer's Name: PH1 FITCH Location: NAVAL STATION, NORFOLK Date Shot: 7/8/1978 Date Posted: unknown