and used on a number of different marine robotic vehicles. It operates by using a transducer to emit a pulse through the water and listen for echoes to return. Using that data, it's able to determine the distance from the strongest echo, which can be the seafloor, a concrete structure, or other larger obstacle. A fishfinder is an echo sounding device used by both recreational and commercial fishers.

Multibeam

Common use

As well as an aid to navigation (most larger vessels will have

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