Understanding Sonar History; Real Time Sonar (Rts®) Window - Humminbird 1157c Combo Installating And Operation Manual

Understanding Sonar History

It is important to understand the significance of the 1100 Series™ display. The display does NOT show a
literal 3-dimensional representation of what is under the water. Each vertical band of data received by the
control head and plotted on the display represents something that was detected by a sonar return at a
particular time. As both the boat and the targets (fish) may be moving, the returns are only showing a
particular segment of time when objects were detected, not exactly where those objects are in relation to
other objects shown on the display.
Real Time Sonar (RTS®) Window
A Real Time Sonar (RTS®) Window appears on the right side of the display in the Sonar View only. The RTS®
Window always updates at the fastest rate possible for depth conditions and shows only the returns from
the bottom, structure and fish that are within the transducer beam. The RTS® Window plots the depth and
intensity of a sonar return. (See Sonar Menu: RTS® Window).
The Narrow RTS® Window
indicates the sonar intensity
through the use of colors. Red
indicates a strong return and
blue indicates a weak return.
The depth of the sonar return is
indicated by the vertical
placement of the return on the
display depth scale.
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The Wide RTS® Window
indicates the sonar intensity
through the use of a bar graph.
The length of the plotted return
provides an indication of
whether the return is weak or
strong. The depth of the sonar
return is indicated by the
vertical placement of the return
on the display depth scale.