Furuno COLOR VIDEO PLOTTER 1933C - Manual (Page 146)

4. VIDEO SOUNDER OPERATION
4-2
4.2 Sounder Displays
4.2.1 Selecting a sounder display
There are seven display modes from which to choose: dual frequency, single
frequency, marker zoom, bottom zoom, bottom lock, bottom discrimination, and
A-scope.
To select a display;
1. Press the [DISP] key and then select sounder display desired.
2. If not already displayed, press the [HIDE/SHOW] soft key to show the
sounder soft keys.
3. Press the DISPLY MODE soft key to show the display mode window.
DISPLAY MODE
¤ DUAL FREQ
¡ SINGLE FREQ
¡ MARKER ZOOM
¡ BOTTOM ZOOM
¡ BOTTOM LOCK
¡ BOTTOM DSCRM
Display mode window
4. Use the trackball or the [ENTER] knob to select a display.
5. Press the RETURN soft key to close the window.
Note: On menus which show the RETURN soft key you may use it or the
ENTER knob to register setting and close the window.