Sonar View; Sonar Zoom View - Humminbird 931C Installation And Operation Manual

93x_Man_531370-1_A - vs4.qxd 2/18/2005

SONAR VIEW

Sonar View presents a historical log of sonar returns. The most recent sonar returns
are charted on the right side of the window; as new information is received, the older
information is moved across the display to the left. A scale with Upper and Lower
Depth Range readouts appears along the right edge of the Sonar View. The scale
indicates the distance from the surface of the water to a depth range sufficient to
show the bottom. Depth Range is automatically selected to keep the bottom visible on
the display, although you can adjust it manually as well (see Sonar X-Press™ Menu).
Sonar View
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1
2
3
4
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Depth
2
Triplog
3 Temperature
4 Speed
5
Cursor
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Depth of Cursor
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Freeze Frame - Pressing any arrow on the 4-WAY Cursor Control key will freeze the screen
in the Sonar View and a cursor and cursor dialog box 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.
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SONAR ZOOM VIEW

Sonar Zoom View increases the displayed resolution to separate sonar returns that are
very close together, such as those caused by fish suspended close to the bottom or within
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structure. In Zoom View, the display is split to show a narrow slice of the full range view
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on the right and the zoomed view on the left. The full range view on the right also
contains the Zoom Preview Box that shows what part of the full range view is shown in
11 zoom view on the left; the Zoom Preview Box tracks the bottom in the full range view.
As the depth changes, the zoomed view updates automatically to display a magnified
image of the bottom. The Zoom Preview Box shows where the zoomed view is in
relation to the full range view. The Zoom Level, or magnification, is displayed in the
lower left corner and can be changed to suit conditions (see Sonar X-Press™ Menu:
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Zoom Level). Upper and Lower Zoom Depth Range numbers indicate the depth of the
water which is being viewed.
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Depth below Cursor
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Distance to Cursor
Bearing to Cursor 9
RTS® Window 10
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Sonar Color Bar
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Lower Depth Range
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NOTE:If the Depth number is flashing, it means that the unit is having trouble locating the bottom.
This usually happens if the water is too deep, the transducer is out of the water, the boat is moving
too fast, or for any other reason that the unit can't accurately receive continuous data.