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echo sounder

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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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
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Encyclopedia Article for echo-sounder

echo sounder

device used on ships to determine the depth of water by measuring the time it takes a sound (sonic pulse) produced just below the water surface to return, or echo, from the bottom of the body of water. Sonic depth finders are in operation on practically every important class of ship, naval and merchant, and are also used on small craft.

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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9
9
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