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• n  a measuring instrument that sends out an acoustic pulse in water and measures distances in terms of the time for the echo of the pulse to return
  sonar is an acronym for sound navigation ranging

• Scientists have known for years that bats navigate by sonar.
• The baiji depend on their sonar ability to survive.
• The real explanation is far less fun: Google Earth engineers soon announced that the grid pattern was merely a digital artifact created by the sonar boats collecting mapping data.

• echo sounder
• asdic

News & Articles

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• Photographer missing after losing bike in river
  The Waterbury Republican-American reports  authorities have been using sonar to search for signs of 33-year-old Eric Langlois in the large section of the Housatonic known as Lake Lillinonah.
  June 13, 2013 - The Norwich Bulletin
• Crews searching Little Miami by boat, helicopter for teen
  After a strong summer thunderstorm swept through the region this morning, crews are searching for a missing teen in the Little Miami River with sonar equipment on boat and by helicopter.
  June 13, 2013 - The Cincinnati Enquirer
• Sonar integration contract for Northrop
  ANNAPOLIS, Md., June 11 (UPI) -- The U.S. Navy has contracted Northrop Grumman to support integration of its AQS-24A Side Look Sonar System onto an unmanned surface vessel.
  June 11, 2013 - UPI

Quotes

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• Bernie Bickerstaff in USA Today
  Adam has those sonar ears, like a bat,Bickerstaff said. "That's another thing a rookie has to learn. ...... When you move to this level, you've got fans, they're as good at what they do as the players on the court."
• Stephen Saunders in Sydney Morning Herald
  Saunders explained: "The modus operandi of most submarines, particularly ballistic missile submarines, is to operate stealthily and to proceed undetected. This means operating passively (ie not transmitting on sonar) and making as little noise as...
• John Roberts in RedOrbit
  The Navy's need to conduct realistic training with active sonar to respond to the threat posed by enemy submarines outweighs the interests advanced by the environmentalists,Roberts said.