The fish finder sends out ultrasonic waves that travel right under the boat. If they hit a school of fish, very weak echoes will go back to where the ultrasonic waves were sent.
The reflected sound is turned into an electrical signal, which is then sent to the fish finder's receiving circuit. The receiving circuit boosts the weak signals, and the processor unit uses those signals to make images that are shown on the screen.
Because of this, the image will show up on the color LCD. On the screen, reflections that are stronger are shown in orange or red, and reflections that are weaker are shown in green or blue.
Large schools of fish or rocks on the seabed send back stronger signals, so they are shown in a reddish color. A small school of fish or rocks on the seabed sends back weaker signals, so they are shown in a blueish color.
The color presentation can show clearly what is going on under the sea.
A fish finder helps you find a school of fish and gives you information about the water depth, where the school is, and how the seabed is doing.
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