Fish finders are gadgets that help to determine the depth of water from a boat and detect if any objects are present in the water. The transducer sends a conical sound wave, called sonar, which travels through the water like an expanding cone. Whenever any obstruction comes in its path, it reflects back the sound wave to the transducer. The time taken for the sonar to return helps to calculate the distance of the object from the transducer.

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