Three-beam fish finders
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— a three-beam layout usually involves a vertical narrow beam for collecting data on the depth and topography of the bottom, as well as a pair of wide beams directed in different directions and responsible for detecting fish and other underwater objects. Like dual-beam models, such models combine the advantages of beams of different widths (for more details, see "Total Beam Angle"), while they are also able to determine the location of prey — to the right or left of the side.