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Reading a fish finder is pretty simple. You can set the scale to find the depth of the fish. Larger images can be a school of fish or the monster that keeps getting away.
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Humminbird and Lowrance both make a great fish finder. Humminbird is the only fish finder that has side imaging and it's actually cheaper than Lowrance and Garmin.
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A fish finder uses sonar technology which was originally developed for the Navy to track submarines. The sonar unit on a fish finder sends and receives echos and then shows the results
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A fish finder works by sending sound waves down into the water. When the sound waves hit an object, they bounce back and transmit a sound back to the fish finder along with digital
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