Chart Speed; Imaging Colors - Humminbird 398ci SI Combo Operation Manual

Chart Speed determines the speed at which the sonar information moves across
the display, and consequently, the amount of detail shown.
A faster speed shows more information and is preferred by most anglers;
however, the sonar information moves across the display quickly. A slower speed
keeps the information on the display longer, but the bottom and fish details
become compressed and may be difficult to interpret.
Imaging Colors allows you to select which color palette you would like to use
for the Down Imaging® display. Imaging Colors also changes the palette used
in the Side Imaging® View.

Chart Speed

Settings: 1 to 9, Ultra, where 1 = Slow, 9 = Fast, Ultra =
Fastest; Default = 5

Imaging Colors

Settings: Blue, Amber 1, Amber 2, Brown, Green, Inverse,
Gray, Green/Red; Default = Amber 1
107 Down Imaging® X-Press™ Menu