Understanding The Side Imaging® Display - Humminbird 1158c Combo Installation And Operation Manual

Understanding the Side Imaging® Display
It is important to understand how Side Imaging® technology produces the display. The images
you see on the display are produced using sonar technology. The special transducer projects
three distinct beams – one beam facing down and two beams pointing out to the side.
Down Beam is aimed directly below the boat and provides conical coverage.
Side Beams are aimed at right angles to the path of the boat. The side beam coverage
is very thin from front to back, yet very wide top to bottom. The narrow aspect (front to
back) of the beam illuminates a small strip of the bottom perpendicular to the direction
of the boat.
As the unit pings, a strip of data is displayed at the top of the Side Imaging® view.
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.
The rows closest to the boat icon at the top of the view are the most recent sonar data.
The information is scrolled down the screen as new data, drawn at the top of the screen,
becomes available.
What's on the Side Imaging® Display
Side Imaging® Representation
Creek Bed Rock Bait Ball
Water Column
Fish Tree Stump Bank
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Side Imaging®
Sonar echoes are
first displayed at
the top of the
screen, and
historical data
scrolls down the
display as new
information is
received.