Furuno GP-7000F - Manual (Page 97)

10. VIDEO SOUNDER OPERATION
10-11
10.3.3 Adjusting the gain
Normally, set the gain to the point where excessive noise does not appear on the
screen. Use a higher gain setting for greater depths and a lower setting for
shallower water.
Gain too high Gain proper Gain too low
Examples of proper and improper gain
1. Push the [ENTER] knob to show the SENSITIVITY window.
Note:
This window can also be accessed with the SENSITIVITY menu.
GAIN 50* 000
NOISE LIMITER HIGH
CLUTTER 0
WHITE MARKER OFF
SIGNAL LEVEL OFF
*: For menu operation, both
of 50 and 200 frequencies appear.
Sensitivity window
2. For menu operation, choose GAIN 50 (kHz) or GAIN 200 (kHz) as
appropriate and then push the [ENTER] knob.
3. Rotate the [ENTER] knob to adjust. (Setting range: 0 to 100%)
4. Push the [ENTER] knob to set.
5. Press the [MENU] key to close the menu.
Note:
Gain cannot be adjusted in the automatic sounder mode.