Furuno GD-1700C - 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 select a sounder display.
2. If not displayed, press the [HIDE/SHOW] 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
HF: 200.0 kHz
LF: 50.0 kHz
Display mode window
4. Use the cursor pad 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.