SONAR stands for SOund NAvigation Ranging. A sonar device sends pulses of sound waves down through the water. When these pulses hit objects like fish, vegetation or the bottom, they are reflected back to the surface. The sonar device measures how long it takes for the sound wave to travel down, hit an object and then bounce back up. Once a returning pulse is received, another one is sent out. Because sound waves travel at roughly one mile a second in water, sonars can send multiple pulses per second. The Deeper PRO and Deeper PRO+ send 15 pulses per second. The returning sound pulses are converted into electrical signals and then displayed, showing anglers the depth and hardness of the bottom and any objects in between.
Deeper Smart Sonar is not only just a sonar though. It creates its own Wi-Fi hotspot that you can connect to with your phone. Afterwards, with the help of the Deeper application, your phone will be used as an information processing device of the sonar. Deeper app uses smart algorithms that identify fish based on the return, and it has many other extremely useful features that help any angler, in any type of fishing.
To learn more about how to read the sonar and identify vegetation, features of the bottom as well as fish, please read here