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sonic depth finder

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noun
  1. a sonar instrument that uses echolocation to measure depths under water.
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 sonic depth finder

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
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