Humminbird 747c Operation Manual page 19

531526-1_A - 747c_&_777c2_Man_Eng.qxp 10/2/2006 1:41 AM Page 19
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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