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In today’s world, technology has a strong place in various areas of people’s lives. Fishing has also found a great use for high-end digital electronics. Echo sounders have become faithful assistants of many anglers. Passionate fishermen use echo sounders to explore the bottom relief, depth of the water body and search for places where fish congregate. Most fishing enthusiasts sooner or later think about buying an electronic assistant – echo sounder. In this section of the Encyclopedia of Fishing everyone can get acquainted with the classification of echo sounders and their features. Here are articles where the reader can find information about the models of interest, their differences and principles of operation.