˜yÐÄvlog

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sonic depth finder

noun

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

sonic depth finder

noun

  1. 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
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˜yÐÄvlog History and Origins

Origin of sonic depth finder1

First recorded in 1925–30

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