Once perceived as a gimmick, today's depthsounder sonars are indispensable to the pro. These devices use a component mounted under the boat, called a transducer, to project sound pulses into the water. When these sound pulses meet the bottom or other solid features such as rocks, stumps, channel edges, and so forth, the pulses bounce back as echoes. The transducer reads these echoes to create a picture on the depthsounder display, typically a liquid crystal display screen.
Properly tuned, a depthsounder is invaluable for helping you see good fish-holding structure below the boat. You may also be able to see suspended fish. However, bass hold very close to structure and may not be visible as a separate shape on the display. Most depthsounders display the bottom as a detailed cross-section, as well as indicate water temperature and depth. Some newer units also feature lower-resolution 3-D views and the ability to "side-scan" a wide angle around the boat. All require practice to fine-tune and interpret correctly.
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