Furuno FCV-30 Operator's Manual page 89

3. CHANGING SETTINGS
ETR Color dialog box
Day/Night: Choose background color of the echo sounder window. Choose "Day" for white
background; "Night" for black background.
Hue: Choose color arrangement for the echo sounder image. The procedure is the same as
that shown in paragraph 3.6.
VRM: Choose color for the horizontal and vertical VRMs.
3-21