Sonar Options; Surface Clarity; Noise Rejection - Lowrance Mark-4 HDI Operation Manual

Sonar Options

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 sur-
face clutter by decreasing the
sensitivity of the receiver near
the surface.
Split Zoom and Split Flasher
Switches the sonar display from full screen sonar to
a split screen view.
Split Zoom
Color
Allows you to change the look of the display using
palettes with varying degrees of color/brightness.
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Sonar Operation |
Surface Clutter
Split Flasher
Mark-4 & Elite-4 HDI