Humminbird 700 series - Manual (Page 37)

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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.
The sonar returns from the bottom, structure and fish can be represented as
either WhiteLine® or Structure ID®. See Sonar Menu Tab: Bottom View for
details on how to set the bottom view.
Bottom Contour Profile with RTS® Window
Rocky Bottom
Hard Bottom
Soft Bottom
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