echo sounding

World English Dictionary
echo sounder
 
n
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
 
echo sounding
 
n

Collins English Dictionary - Complete & Unabridged 10th Edition
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WordNet
echo sounding

noun
determining the location of something by measuring the time it takes for an echo to return from it [syn: echolocation
WordNet® 3.0, © 2006 by Princeton University.
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