Humminbird Matrix 67 Operation Manual page 16

10
Inverse is a method where weak returns are shown with dark
pixels and strong returns with lighter pixels. This has the benefit
of ensuring that weak signals will be clearly visible on the
display.
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.
Bottom Black displays all pixels below the bottom contour as
black, regardless of signal strength. This has the benefit of
providing a high contrast between the bottom and other sonar
returns on the display. Any targets such as fish, structure and
thermoclines will be shown using the Structure ID® method.