Lowrance Mark-4 Operation Manual page 32

Noise Rejection
Uses advanced signal processing to monitor the ef-
fects noise (boat pumps, water conditions, engine
ignition systems, etc.) has on your display, and then
filters out undesired signals.
Surface Clarity
Surface Clarity reduces surface clutter by
decreasing the sensitivity of the receiver near the
surface.
Surface Clarity
set to Low.
Surface Clarity
set to High.
29
Split Zoom
Changes the display to a split zoom view.
Color
Allows you to select a color
palette best suited to your
fishing conditions.
The white background palette works well for
suspended targets. Purple is useful for viewing
structure detail and determining bottom hardness.
Sepia is best for looking at bottom detail.
DownScan Operation | Elite series