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sonic depth finder

noun
  1. a sonar instrument that uses echolocation to measure depths under water.
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Compare Fathometer.

Origin of sonic depth finder

First recorded in 1925–30
Also called echo sounder.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for echo sounder

echo sounder

noun
  1. a navigation and position-finding device that determines depth by measuring the time taken for a pulse of high-frequency sound to reach the sea bed or a submerged object and for the echo to return
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Derived Formsecho sounding, noun

sonic depth finder

noun
  1. an instrument for detecting the depth of water or of a submerged object by means of sound waves; FathometerSee also sonar
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Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012