Automatic Echo Sounder Operation; How To Select An Automatic Echo Sounder Mode; How To Offset The Base Range Or The Gain - Furuno GP-3700F Operator's Manual

11. ECHO SOUNDER
11.3

Automatic Echo Sounder Operation

The automatic fish finder function automatically adjusts the gain, clutter, and range, to
free you to do other tasks. The main features of the automatic mode are as shown be-
low.
• Range is adjusted automatically to show the bottom echo.
• Gain adjusts the sensitivity of the receiver to show the bottom echo in reddish-
brown (default color arrangement).
• Clutter automatically reduces low-level noise like plankton.
Two types of automatic sounder modes are available: [CRUISING] and [FISHING].
[CRUISING] is for tracking the bottom, and [FISHING] is for searching schools of fish.
It is useful to select [CRUISING] until arriving at fishing ground, then select [FISHING]
at the fishing ground.
11.3.1

How to select an automatic 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 [CRUISING] or [FISHING]. [AUTOC] or [AUTOF] appears at the top of the
echo sounder display depending on your selection.
5. Press the DISP key to close the menu.
Note: Manual SHIFT and CLUTTER functions are inoperative in the automatic mode.
11.3.2

How to offset the base range or the gain

How to offset the base range
The basic range in the automatic mode can be offset to view the bottom in detail.
1. Press the RANGE key to show the [BTM DISP RNG U/LIM] window.
Note: The [BTM DISP RNG] window closes automatically when there is no oper-
ation for 10 seconds.
2. Set an offset value for upper limit (5% steps).
3. Press the RANGE key again to show the [BTM DISP RNG L/LIM] window.
11-8
Press the RANGE key.