A fish finder also known as Sounders is a device used by anglers to locate fish in the water when you are in your boat. It consists of two parts: the transducer mounted on the hull connected to the central unit with that contains a sensor that sends information to the screen and the main unit designed with a screen display technology to show potential fish.
It works on the SONAR technology system (Sound Navigation and Ranging). The fishfinder is designed with radar, electronic compasses, and a GPS making it more reliable.
When you turn on the fish finder, the transmitter on the transducer will send out sonar waves down the water that uses the echoes to reflect back the signals waves to the transducer. When the wave bumps into different objects in the water, it estimates the depth and size of the object. The fish signal sent back to the transmitter is different from those from objects likes stones, corals or any other obstacles.
The transmitter measures the newly received sonar waves and transmits the measurement to the central unit of the fish finder. The wave’s information is recorded and displayed on the screen.
The readings are displayed based on your type of fish finder. The fish is displayed with a fish symbol while other obstacle objects are displayed with different symbols.