Down Imaging Sonar - Humminbird Fishin' Buddy MAX Operation Manual

Down Imaging Sonar

In addition to Dual Beam sonar, the Down Imaging fishfinder uses Down Imaging
sonar technology. The Down Imaging transducer scans the water with a razor-thin
74° beam (455 kHz) that is wide (side to side) and very thin (front to back).
bottom return
dark shades
(weak returns)
Use the light and dark parts of the display to interpret the objects under your
boat as follows:
• Dark shades represent soft returns (mud, sand) or descending terrain.
• Light shades represent denser terrain (timber, rocks) or rising terrain.
A very hard bottom may appear as white on the display.
• White Streaks or Clouds may represent fish or vegetation on the display.
• Shadows are not caused by light but by the lack of a sonar return. Objects
standing on the bottom cause a sonar shadow to appear on the display.
The longer the shadow, the taller the object. Fish may also cast shadows.
Down Imaging View
Sonar History: historical returns
scroll left across the view.
3
(Down Imaging models only)
white streaks
or clouds
light shades
(strong returns)
Sonar Technology