Furuno FSV25S, Operator'S Manual

Page: 82 / 163

3. VERTICAL MODE
3-8
3.7.2 Change near gain, far gain
This sonar lets you adjust near gain and far gain separately.
1. Press the MENU/ESC key to open the main menu.
2. Click [Gain Setting].
3. Press the
H/V/S key to select the [V] tab.
4. Click [Near Gain Distance] or [Far Gain Distance].
5. Click
S or T to select a suitable value.
6. Click [Quit].
7. Click [Near Gain] or [Far Gain].
[Near Gain] : Adjust sensitivity in area closer than [Near Gain Distance].
[Far Gain] : Adjust sensitivity in area further than [Far Gain Distance].
8. Click S or T as appropriate then push the left button.
The setting range is 0.0 to 10.0. Setting “5” does not correct the gain. Use a setting
lower than 4 to lower the gain, or use a setting higher than 5 to raise the gain.
9. Click [Quit] on the setting box to close the box.
10. Long-push the
MENU/ESC key to close all menus.
3.8 How to Adjust Strong, Weak Echoes
3.8.1 AGC
The AGC functions to automatically reduce the receiver gain only against strong ech-
oes such as the bottom or a large school of fish. Since weak echoes remain unaffect-
ed, a small school of fish becomes easier to detect. Adjust it so that the AGC works
only on bottom reflections. Do not set it too high; weak echoes may be missed.
1. Press the MENU/ESC key to show the main menu.
2. Click [Gain Setting].
3. Press the
H/V/S key to select the [V] tab.
4. Click [AGC].
5. Click
S
or
T
to change the setting. The setting range is 0.0 to 10.0. The higher
the setting, the higher the degree of suppression.
6. Click [Quit] on the setting box to close the box.
7. Long-push the
MENU/ESC key to close all menus.
Quit
Cancel
400m
(20~1600)