Answer:
Sound
Navigation And Ranging: A transmitter producing ultrasonic waves is fitted at
the bottom of a ship or a boat. The ultrasound waves emitted by the transmitter
go to the bottom of the sea and get reflected from the bottom.
These are received back by a detector also fitted at the bottom. Knowing
the time elapsing between sending and receiving back of the ultrasonic waves
and the speed of these waves in water, the depth of sea can be calculated.
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