Furuno FCV-30 Operator's Manual page 84

3. CHANGING SETTINGS
Screen layout: Show the external echo sounder image in horizontal or vertical split. The
low frequency-zoom, high frequency-zoom display or dual frequency display must be active,
otherwise this feature is inoperative.
A-scope: Turn the A-scope display on or off.
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.
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