Humminbird 1197C SI - Manual (Page 57)

Sonar 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.
NOTE: A sloping bottom will be represented as a thicker line across the display. Harder bottoms typically will be
displayed with red and softer bottoms typically will be displayed with blue.
The sonar returns from the bottom, structure and fish can be represented as either Structure ID® or
WhiteLine®. See Sonar Menu: Bottom View for details on how to set the bottom view.
Structure ID® represents weak returns in blue and strong returns in red.
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