Before you can decide which fishfinder is the best one for you, you should be aware of how a fishfinder performs
Fishfinders utilize sonar technology to find fish-or any other good object-under that the surface of the water. Sonar sound waves go through the water. The further the sound waves travel, the more they fan out into a cone shape and increase in diameter. Deeper water obviously causes the cone to become bigger as it goes out of it's origin. Whenever the sonar wave strikes against a good object of any substance, it will rebound an echo back to the transducer. The form of the object struck will be decided by how much time it took the signal to head out and then bounce the audio wave echo back in contrast to the surrounding area. The echo will subsequently show up on your fishfinder display and you'll see the aproximate dimensions, shape and thickness of the item.
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