How To Enable Automatic Sounder Operation; Manual Sounder Operation; Selecting The Manual Mode; Selecting Display Range - Furuno NAVNET GD-1920C Operator's Manual

4.2.3 How to enable automatic sounder operation

1. If not displayed, press the HIDE/SHOW key to show the sounder soft keys.
2. Press the AUTO/D. BOX soft key.
AUTO MODE
CRUISING
FISHING
OFF (MANUAL)
Mode/frequency window
3. Use the Trackball or the ENTER knob to select CRUISING or FISHING as appropriate.
4. Press the RETURN soft key.
4.3

Manual Sounder Operation

Manual operation is useful for observing fish schools and bottom using a fixed gain setting.
The gain, range and range shift functions used together give you the means to select the
depth you can see on the screen. The basic range can be thought of as providing a
"window" into the water column and range shifting as moving the "window" to the desired
depth.

4.3.1 Selecting the manual mode

1. If not displayed, press the HIDE/SHOW key to show the sounder soft keys.
2. Press the AUTO/D. BOX soft key to show the mode/frequency window.
3. Select OFF (MANUAL).
4. Press the RETURN soft key.

4.3.2 Selecting display range

Press the [RANGE +] or [RANGE -] key to select a range. The default ranges in feet, meters,
fathoms and passi/braza are as below. Note that the range cannot be changed in the
automatic sounder mode.
Range 1 Range 2 Range 3
15 ft 30 ft 60 ft
5 m 10 m 20 m
3 fa 5 fa 10 fa
3 P/B 5 P/B 10 P/B
Default sounder ranges
Range 4 Range 5 Range 6
120 ft 200 ft 400 ft
40 m 80 m 150 m
20 fa 40 fa 80 fa
30 P/B 50 P/B 100 P/B
4. VIDEO SOUNDER OPERATION
Range 7 Range 8
ETR-6/10N
1000 ft 4000 ft
300 m 1200 m
150 fa 650 fa
200 P/B 700 P/B
ETR-30N
4500 ft
1500 m
900 fa
900 P/B
4-7