From a RealVü sonar view, select Menu > Sonar Setup > Appearance.

Point Colors

Sets a different color palette for the sonar return points.

Bottom Colors

Sets the color scheme for the bottom.

Bottom Style

Sets the style for the bottom. When you are in deep water, you can select the Points option and manually set the range to a shallower value.

Color Key

Shows a legend of the depths the colors represent.