Down Imaging

Category: Electronics

Down imaging (also called DownScan on Lowrance or MEGA Down Imaging on Humminbird) uses a narrow, high-frequency sonar beam directed straight down to create highly detailed images of the bottom directly beneath the boat. Unlike traditional 2D sonar which shows a wide cone and can blur targets together, down imaging provides much sharper target separation and clearer images of individual fish, standing timber, brush piles, and bottom features. Down imaging is the preferred sonar view for identifying what you're directly over — confirming that a traditional sonar mark is actually a fish rather than a piece of structure, viewing the shape and density of a brush pile before casting, or examining bottom composition (rock, gravel, sand, mud) with more clarity than 2D sonar. Down imaging and 2D sonar are often displayed in a split-screen configuration, with traditional sonar providing the wide-area view and down imaging providing the detail. Frequency typically ranges from 455 kHz to 1200 kHz — higher frequencies provide sharper images but reduce effective depth range. Most anglers use 455 kHz for general use and 800 kHz when they need maximum detail in shallower water.