Echo sounder working Principle ?

What is an Echo Sounder ?
Explain the principle of an Echo sounder using a diagram ?
Formula used to determine the depth of the sea ?
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Echo sounder working principle ?

[@romanticboy_1mv]

Very very nice video...

[@abhishekkr618]

Informative video.. thank you.

[@NavigatewithAnkit]

Glad it was helpful!

[@romanticboy_1mv]

Yes... I learn many things from these videos