echo sounder

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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

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Encyclopedia Britannica
Encyclopedia

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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Example sentences
Our first hint that active venting is occurring comes from the ship's echo
  sounder.
The echo sounder emits pulses of sound that are reflected off the lake bottom
  and then received by a transducer.
The echo sounder emits sound pulses that are reflected off the lake bottom and
  received by a transducer.
The echo sounder emits pulses of sound that are reflected off the lake bottom
  and received by a transducer.
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