NorthStar Navigation Echo Sounder NorthStar 491 - Manual (Page 37)

491 Echo Sounder Operations Manual Page 33
Hue and white level window
4. Press RETURN to go back to the ECHO screen.
Setting the white
level
You can replace any single color in the color bar with white.
On the HUE AND WHITE LEVEL window, press the CURSOR
PAD up or down to select that color.
To remove the white level and return to using all the colors on
the color bar, press the CURSOR PAD down until the white
level moves off the color bar.