from The American Heritage® Dictionary of the English Language, 4th Edition
- n. A system using transmitted and reflected underwater sound waves to detect and locate submerged objects or measure the distance to the floor of a body of water.
- n. An apparatus, as one in a submarine, using sonar.
- n. Echolocation.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. echolocation
- n. A device that uses hydrophones (in the same manner as radar) to locate objects underwater.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- 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
If your sonar is marking fish at 25 feet, for example, let out about 3.5 colors.
Their echolocation sonar is far beyond our military science.
It was detected about five years ago with sonar from a surface vessel.
Electric trolling motors have become extraordinarily sophisticated, with built-in sonar transducers, wireless remote controls, and improved mounting systems adding to both utility and price.
Side-imaging sonar is getting most of the buzz in fishing electronics this season, and for good reason: For finding gamefish, baitfish, and likely structure, these units have no equal in the consumer market.
"Effective use of active sonar is a vital and perishable skill set that must be continually practiced," he added, calling anti-submarine warfare the top priority for the U.S. Pacific Fleet Commander.
The Navy claims that training sailors to detect submarines using mid-frequency active sonar is crucial to military operations in the Pacific.
The steam propulsion system are virtually silent and active sonar is the only option for detection.
Mechanically, man has learned to use ultrasonic waves for echolocation (in the precise manner of bats) in a device called sonar, which is an abbreviation for "sound navigation and ranging."
Mr. Gallo at Woods Hole said the search team will now use high-definition sonar and photography to document the crash site, which will assist both recovery efforts and analysis of the crash.