Humminbird 385ci - Manual (Page 28)

16
Understanding the
Down Imaging™ Display
The images you see on the Down Imaging™
display are produced using sonar technology. Each
time the unit pings, a strip of data representing all
the echoes received by the transducer are put
together on the display to form the image that you
see. Like traditional 2D Sonar, the sonar history
scrolls left across the screen.
Interpreting the Display
Down Imaging™ beams “illuminate” the bottom contour, structure, and fish.
The beams are wide (side to side) but very thin front to back.
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 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. You can use the shadow to interpret where the fish or object
is located in relation to the bottom.
What’s on the Down Imaging™ Display