Understanding Sonar History; Real Time Sonar (Rts®) Window; Freeze Frame; Bottom Presentation - Humminbird 363 Operation Manual

531448-1_A - 363_Man_Eng.qxd 11/9/2005

Understanding Sonar History

It is important to understand the significance of
the 300 Series
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
grayscale. The grayscale
used matches the bottom
view grayscale setting used
in the sonar history window
(i.e. 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.
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TM Fishing System display. The
The Wide RTS® Window in-
dicates 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. The
Wide RTS® Window does not
make use of grayscale.
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Freeze Frame

Freeze Frame - Pressing any arrow on the 4-WAY Cursor Control key will freeze the
screen and a cursor will be displayed on the screen. The cursor can be positioned on the
display using the 4-WAY Cursor Control key to determine the depth of any sonar return.
The RTS® Window continues to update in Freeze Frame. In addition, see the effects of
menu setting changes with Instant Image Update. Pressing EXIT will exit Freeze Frame
and the display will start to scroll. Freeze Frame is available in the Sonar, Sonar Zoom,
and 200/83 kHz Split Sonar Views.

Bottom Presentation

As the boat moves, the unit charts the changes in depth on the display to create a
profile of the Bottom Contour. The type of bottom can be determined from the return
charted on the display. A Hard Bottom such as compacted sediment or flat rock appears
as a thinner line across the display. A Soft Bottom such as mud or sand appears as a
thicker line across the display. Rocky Bottoms have a broken, random appearance.
Bottom Contour Profile with RTS® Window.
Temp/Speed Accessory is optional.
Hard Bottom
Rocky Bottom
The sonar returns from the bottom, structure and fish can be represented as either
Inverse (default), WhiteLine®, Structure ID®, or Bottom Black. See Sonar X-Press
Menu: Bottom View for details on how to set the bottom view.
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Soft Bottom
TM