Humminbird 778C - Manual (Page 22)

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Use Bottom View to select the method used to represent bottom and structure
on the display. See Sonar Menu Tab to set the Bottom View.
Structure ID® represents weak returns in blue and strong returns in red
when Sonar Colors is set to Original. If the Sonar Colors palette is changed,
the Structure ID® will display the strongest return as specified by the
palette. See Sonar Menu Tab: Sonar Colors for more information.
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.
What’s on the Sonar Display