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sonic depth finder

noun
1.
a sonar instrument that uses echolocation to measure depths under water.
Also called echo sounder.
Compare Fathometer.
Origin of sonic depth finder
1925-1930
1925-30
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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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
Derived Forms
echo 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; 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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Word Value for echo

9
9
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