When the echosounder is activated, it sends a short pulse of sound waves down through the water towards the seabed. When these sound waves reach the seabed, they bounce back and are detected by the echosounder’s transducer.
The time taken for the sound waves to travel down and back is measured and used to calculate the depth of the water beneath the ship.
The received echoes are converted into electrical signals by the receiving transducer and then processed by the echosounder’s electronic circuitry.
The processed data is then displayed on the echosounder’s screen, which shows the depth of the water as well as any obstructions or features on the seabed.
Some advanced echosounders can also provide additional information such as water temperature, speed of sound in water, and fish location.
This information can be used by navigators and fishermen for various purposes such as avoiding shallow waters, locating fish schools, and mapping the ocean floor.