Understanding Sonar History; Real Time Sonar (Rts®) Window; Freeze Frame; Bottom Presentation - Humminbird 531438-1_A Operation Manual

531438-1_A - 737_EnglishOnly.qxd

Understanding Sonar History

It is important to understand the significance of the 700
Series™ Fishing System 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 grayscale.
The grayscale used matches
the bottom view grayscale
setting used in the sonar
history window (i.e. Inverse,
Structure ID®, WhiteLine®,
Bottom Black). The depth of
the sonar return is indicated
by the vertical placement of
the return on the display
depth scale.

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.
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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. The
Wide RTS® Window does not
make use of grayscale.
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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
details on how to set the bottom view.
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Soft Bottom
TM Menu: Bottom View for