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sonic depth finder

American

noun

a sonar instrument that uses echolocation to measure depths under water.

sonic depth finder British

noun

an instrument for detecting the depth of water or of a submerged object by means of sound waves; Fathometer See 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

Etymology

Origin of sonic depth finder

First recorded in 1925–30

Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023