Bottom View (Sonar View Only) - Humminbird PiranhaMAX 197c Installation And Operation Manual

Bottom View selects the method used to represent the bottom and structure
on the display.
Setting up the Control Head
Bottom View
Settings: Structure ID, WhiteLine; Default = Structure ID,
Setting Saved in Memory
Structure ID represents weak returns as light pixels and
strong returns as dark pixels. This has the benefit of
ensuring that strong returns will be clearly visible on the
display.
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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(Sonar View only)