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what is fathometere ? 

Kindly refer to the following link:
https://www.meritnation.com/ask-answer/question/what-is-fathometer-used-to-measure/science/8838167

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  1. Since a traditional pre-SI unit of water depth was the fathom, an instrument used for determining water depth is sometimes called a fathometer. Most charted ocean depths use an average or standard sound speed.
    A type of active sonar, echo sounding is the transmission of an acoustic pulse directly downwards to the seabed, measuring the time between transmission and echo return, after having hit the bottom and bouncing back to its ship of origin.

    Illustration of echo sounding using a multibeam echosounder.
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