Furuno FSV-30, Operator'S Manual

Page: 46 / 190

2. HORIZONTAL MODE
2-16
2.7.4 Near AGC
When an excessively strong echo is received in shallow or heavily sedimented
waters, you may not be able to suppress it by the TVG control alone. In this case,
a fish school which is displayed at more than 300 m away may disappear
gradually when the ship is approaching the fish school.
Use the Near TVG feature to suppress this strong echo. Normally set it between
3 and 4, however, this setting depends on the sea area. Do not set it too high; all
echoes (including noise) from near distance may be shown clear red.
1. Press the [MENU] key to open the menu.
2. Select H-SCAN SETTING menu and press the [MENU] key.
3. Select NEAR AGC and press the [MENU] key.
4. Adjust setting from the dialog box as appropriate and press the [MENU] key.
The setting range is 1-10. The higher the setting the greater the echo level of
near distance.
5. Select QUIT and press the [MENU] key to conclude.
6. Select QUIT at the top of the menu screen and press the [MENU] key to
close all menus.