Furuno GP-3700F, Operator'S Manual

Page: 157 / 224

11. ECHO SOUNDER
11-9
Note 1: The [BTM DISP RNG] window closes automatically when there is no op-
eration for 10 seconds.
Note 2: The maximum value for upper limit and the minimum value for lower limit
vary depending on the setting value. The setting value for upper limit plus 15
equals the minimum value for lower limit.
4. Set an offset value for lower limit (5% steps).
5. Press the
RANGE key to close the window. The setting window closes automati-
cally after 10 seconds without pressing the RANGE key.
Note: The RANGE key can be programmed for a different function (default setting:
[FISH FINDER DEPTH RANGE]).
How to offset the gain
The gain can be offset in the automatic mode to fine tune the picture.
1. Press the GAIN key to show the [AUTO GAIN OFFSET(LF)] window. To show the
setting window for high frequency, press the GAIN key again.
Note: The [AUTO GAIN OFFSET] window closes automatically when there is no
operation for 10 seconds.
2. Set an offset value (setting range: -5 to +5).
3. Press the
GAIN key to close the window. If setting an offset only for low frequency,
press the GAIN key twice to close the setting window. The setting window closes
automatically after 10 seconds without pressing the GAIN key.
Note: The GAIN key can be programmed for a different function (default setting: [FISH
FINDER GAIN]).
11.4 Manual Echo Sounder Operation
Use the manual operation to see schools of fish and the bottom echo with a fixed gain
and range setting.
11.4.1 How to activate the manual echo sounder mode
1. Press the MENU key to open the main menu.
2. Select [9. ECHO SOUNDER SETTING].
3. Select [1. AUTO] to show the [AUTO] window.
4. Select [MANUAL]. "MANUAL" appears at the top of the echo sounder display.
5. Press the
DISP key to close the menu.
Press the GAIN key.