Humminbird 343c - Manual (Page 9)

Structure ID® represents weak returns in blue and
strong returns in red.
WhiteLine® highlights the strongest sonar returns
in white, resulting in a distinctive outline. This has
the benefit of clearly defining the bottom on the
display.
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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.
Temp/Speed Accessory is optional.
Rocky Bottom
Hard Bottom
Soft Bottom
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