Meaning of “echo sounder” in the English Dictionary

british dictionary

"echo sounder" in British English

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echo soundernoun [ C ]

uk /ˈek.əʊ ˌsaʊn.dər/ us /ˈek.oʊ ˌsaʊn.dɚ/

a piece of equipment, especially on a ship, that uses sound waves to discover water depth or the position of an object in the water

(Definition of “echo sounder” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)