sonic depth finder


noun

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. 2019

British Dictionary definitions for echo sounder (1 of 2)

echo sounder

noun

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

British Dictionary definitions for echo sounder (2 of 2)

sonic depth finder

noun

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