Humminbird 300 SERIES 345C DI - Manual (Page 77)

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Imaging Colors
(Down Imaging™ Views only [345c DI])
Settings: Blue, Amber 1, Amber 2, Brown, Green, Inverse,
Gray, Green/Red; Default = Blue
Imaging Colors allows you to select which color palette you would like to use
for the Down Imaging™ display.
Sonar Menu Tab