Humminbird 581i Combo, Operation Manual

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8
U Un nd de errsstta an nd diin ng g tth he e S So on na arr D Diissp plla ayy
It is important to understand the significance of
the 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.
The returned sonar echoes are displayed on the screen. As a new echo is
received, the historical data scrolls left across the view.
R Re ea all T Tiim me e S So on na arr ((R RT TS S ™ )) W Wiin nd do ow w
A Real Time Sonar (RTS ™ ) Window appears on the right side of the display in
the Sonar View only. The RTS Window ™ 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 Tab: RTS Window ™ ).
The Narrow RTS Window ™
indicates the sonar intensity
through the use of grayscale.
The grayscale used matches
the Bottom View grayscale
setting (Inverse, StructureID®,
WhiteLine
™ , Bottom Black).
The depth of the sonar return
is indicated by the vertical
placement of the return on the
display depth scale.
The Wide RTS Window ™
indicates the sonar intensity
through the use of a bar
graph. The length of the
plotted return indicates
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.
The Wide RTS
Window ™ does not use
grayscale.
What’s On the Sonar Display