Furuno FCV-30 - Manual (Page 84)

3. CHANGING SETTINGS
3-16
ETR display item dialog box
Show or hide Color bar, Time marker, Mode indicator, V-VRM, H-VRM and Depth indication.
Display item: Choose to display or hide color bar, time marker, mode indicator, horizontal
VRM, vertical VRM and depth.
Display size: The size of the external echo sounder window may be set to small, medium
or large.