Sonar
Sonar is a technique that uses sound to navigate, communicate with or detect other vessels, and to observe the distance and velocity of underwater objects. The acoustic frequencies used vary from extremely low (infrasonic) to very high (ultrasonic). The word “sonar” also describes the equipment used to gather and analyze acoustic information. Sonar is used in depth sounding, fish finding, seafloor mapping, Doppler navigation, and acoustic location systems for divers. The term for the scientific study of underwater sound is hydroacoustics.
Three types of technology are categorized as "sonar":
- Passive sonar uses receiving sensors to listen for and analyze the sound made by vessels
- Active sonar uses an acoustic projector to emit pulses of sounds and a receiver which detects the echoes to find the range, bearing and relative motion
- Acoustic communication systems use a projector and receiver at both ends of the acoustic path
Sonar was first proposed as a means of detecting icebergs, but government interest in and funding of sonar systems did not take off until World War I highlighted the threat posed by submarine warfare. Modern technological innovations have included rapid-scanning and side-scan sonar, the echo sounder (or depth detector,) and within-pulse electronic sector scanning sonar (or WPESS). Military uses of sonar include systems used in acoustic homing torpedoes, in acoustic mines and mine detection.

Ocean Infinity Searches for Lost S.Korean Ship
The seabed survey and ocean exploration company Ocean Infinity announced that its vessel…

Alucia2 Installing FarSounder 3D FLS
The FarSounder-1000 Forward Looking Sonar (FLS), has been selected by the OceanX…

Ocean Infinity Joins Search for Lost Bulker
U.S. based Ocean Infinity said it has been awarded a contract from the Government…

Coast Guard, Agency Partners Locate Sunken Barge off Nahant
The Coast Guard and partner agencies located the missing barge, Dredge 200, Wednesday…

GPS, Ice Profiling Sonar Used in Sea Level Variation Study
ASL Environmental Sciences said that Dr. David Holland of New York University, in…

New Moose Boat For SFFD
Moose Boats delivered a M2-38 Catamaran CBRN, Dive and Fire Rescue vessel to San…

Indian Navy Inducts Deep Submarine Rescue Capabilities
The Indian Navy has inducted a Submarine Rescue System with a Deep Submergence Rescue…

Arctic Sea Ice is Youngest and Thinnest Now
The Arctic Ocean's blanket of sea ice has changed since 1958 from predominantly older…

Canada's Halifax-Class Frigates Get a Sonar Upgrade
Nautel, together with General Dynamics, will upgrade and maintain underwater sensors…

Marine Technology: Top Five New Products @ SMM 2018
The SMM 2018 scheduled to take place September 4-7, 2018, in Hamburg, Germany, is…

FarSounder-1000s for New Expedition Cruise Ships
U.S. based marine electronics manufacturer FarSounder said it has received an order…

Indonesians Face Daunting Task to Recover Bodies from Sunken Ferry
Indonesian teams searching a lake for a sunken ferry in the hope of recovering nearly…
"Offshore" refers to the discovery and development of oil and gas resources which lie underwater. Usually the term refers to ocean-based oil extraction , though the term can also apply to drilling in lakes and inland seas. The remote locations…
Marine salvage is the process of rescuing a ship, its cargo, or other property from peril. Salvage encompasses rescue towing, putting out fires, patching or repairing a ship, refloating a sunken or grounded vessel, moving a disabled vessel in order to clear navigation channels…
A winch is a mechanism used to reel in, to let out, or otherwise adjust the tension of a rope, wire, or cable. Boats and ships make use of multiple winches to handle halyards, sheets, as well as anchor or mooring lines. The basic mechanism consists…
Modern pipelines are installed with and other control devices (pumps and valves) to efficiently move liquids, gases, slurries (solid particulates in liquid suspension) and even solids. Pipelines usually consist of welded sections of metal pipe…
All nations require certain standards be met by ships and other marine structures which fly their flag. A classification society, or "Class", is a non-governmental regulatory association which regulates construction of vessels and offshore structures in the maritime industry.