under-ice sonar

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• sea ice — Ice formed from frozen seawater in polar regions. Most sea ice occurs as pack ice, which drifts across the ocean surface; other types of sea ice include fast ice, which is attached to coasts and sometimes the seafloor or between grounded icebergs …   Universalium

• Measurement of sea ice — Annual growth and retreat of the polar ice packs from SeaWiFS images Measurement of sea ice is important for safety of navigation and for monitoring the environment, particularly the climate. Record keeping of direct observations began over a… …   Wikipedia

• Geophysical MASINT — is a branch of Measurement and Signature Intelligence (MASINT) that involves phenomena transmitted through the earth (ground, water, atmosphere) and manmade structures including emitted or reflected sounds, pressure waves, vibrations, and… …   Wikipedia

• Submarine — For other uses, see Submarine (disambiguation). A Japan Maritime Self Defense Force Oyashio class submarine in 2006 A submarine is a watercraft capable of independent operation below the surface of the water. It differs from a submersible, which… …   Wikipedia

• Waldo K. Lyon — He retired in 1996 after 55 years of government service. During his career he advised top Navy officials on essential matters of national defense and was personally thanked by Presidents Eisenhower and Kennedy for his efforts.Military careerFor… …   Wikipedia

• Arctic Submarine Laboratory — The Arctic Submarine Laboratory was a research facility of the U.S. Navy s Electronics Laboratory in San Diego, California. It began as a converted World War II mortar emplacement, Battery Whistler , and was focused on scientific exploration of… …   Wikipedia

• Allan Rockwell McCann — Vice Admiral Allan Rockwell McCann, (September 20, 1896 North Adams, Massachusetts February 22, 1978 San Diego, California) was a United States Navy officer that served in World War I and World War II.Education to World War IAdmiral McCann… …   Wikipedia

• USS Sennet (SS-408) — USS Sennet (SS 408), a Balao class submarine, was a ship of the United States Navy named for the sennet, a barracuda. Sennet was laid down on 8 March 1944 by the Portsmouth Navy Yard in Kittery, Maine; launched on 6 June 1944, sponsored by Mrs.… …   Wikipedia

• commercial fishing — Introduction  the taking of fish and other seafood and resources from oceans, rivers, and lakes for the purpose of marketing them.       Fishing is one of the oldest employments of humankind. Ancient heaps of discarded mollusk shells (shell… …   Universalium

• November class submarine — Class overview Name: project 627 / 627A / 645 Builders: shipyard No. 402 in …   Wikipedia

• History of submarines — The history of submarines covers the historical chronology and facts related to submarines , manned autonomous boats that operate underwater. It includes the history of submersibles , which were designed primarily to operate on the surface, and… …   Wikipedia