Down Imaging (ClearVü) Sonar: See Fish and Structure Below Your Boat
Down Imaging, also called ClearVü, is a sonar technology that gives anglers a high-resolution, detailed view of what’s directly under their boat. Unlike 2D sonar, Down Imaging provides sharp images of fish, structure, and vegetation in vertical detail, making it easier to locate fish hiding in weeds, under ledges, or near underwater structures.
In this summary, you’ll learn:
How Down Imaging works and why it’s useful
How to distinguish fish, weeds, and structure
Optimal settings for beginners and advanced anglers
Common mistakes and tips to improve fishing success
Mastering Down Imaging helps you catch more fish by identifying targets directly under the boat and making precise presentations with lures.
Down Imaging sonar (left) showing suspended bass over weeds
SECTION: HOW DOES DOWN IMAGING WORKS
Down Imaging sends a narrow sonar beam directly beneath the boat, providing a photo-like image of the bottom and everything above it. This allows you to:
See fish in vertical water columns
Spot structure like rocks, logs, and drop-offs
Identify weed beds and vegetation
Tips:
Fish appear as small targets or arches depending on depth
Shadows behind fish help estimate size and position
Use alongside 2D CHIRP to confirm depth and movement
Link:
How to read sonar → for basic sonar reading
Down Imaging sonar (left) showing fish suspended above bottom structure
SECTION: IDENTIFYING FISH ON DOWN IMAGING
Down Imaging allows precise identification of fish directly below the boat:
Suspended fish: Small, isolated targets away from the bottom
Bottom fish: Near structure, easy to spot by size and shape
Shadows: Every fish casts a shadow — bigger shadows usually indicate bigger fish
Pro Tip: Fish often suspend just above weed edges or rocky structures. Down Imaging helps you target them for vertical jigging or drop-shot techniques.
Suspended bass with shadow visible on Down Imaging sonar
SECTION: READING STRUCTURE AND WEEDS
Down Imaging is excellent for spotting structure and vegetation:
Structure: Rocks, logs, humps, and ledges appear as solid, defined shapes
Weeds / vegetation: Fuzzy, vertical patterns extending from the bottom
Edges: Fish often suspend near the edge of weeds or structure
Tip: Combine Down Imaging with Side Imaging to get both vertical and horizontal perspectives of the water column.
Links:
Down Imaging sonar (right) showing bass above weed bed and rocky bottom
SECTION: DOWN IMAGING SETTINGS
Correct settings are essential to get clear, actionable images:
Frequency: 800 kHz for shallow water, 455 kHz for deeper water
Range: Auto mode works for beginners; manually adjust to focus on target depths
Contrast / Brightness: Moderate to clearly see fish and structure
Boat Speed: Slow to moderate — fast speeds blur images
Link:
Beginner sonar settings → for beginner setup guide
SECTION: COMMON DOWN IMAGING MISTAKES
Avoid these mistakes:
Range too high: Fish appear tiny and difficult to see
Too much gain / contrast: Cluttered image hides fish
Too fast: Boat speed blurs the sonar picture
Ignoring shadows: Shadows reveal depth, size, and fish position