Rejecting Interference; Erasing Weak Echoes - Furuno FCV-1900 Operator's Manual

1.17

Rejecting Interference

Interference from other acoustic equipment operating nearby or other electronic
equipment on your boat may show itself on the display as shown in the figure below.
When this occurs use the interference rejector.
1. Press the MENU/ESC key, then open the [Setting] or [Telesounder] tab.
2. Select [Sounder], then push the ENTER knob.
3. Select [Interference], then push the ENTER knob.
4. Select the degree of interference reduction, then push the ENTER knob.
• [Off]: Turn off the interference rejector.
• [Low], [Medium], [High]: [High] provides the greatest degree of sup-
pression and [Low] provides the weakest.
• [Auto]: Automatically reject interference.
Note: Turn off the interference rejector when no interference exists,
so as not to miss weak echoes from small targets.
5. Press the MENU/ESC key several times to close the menu.
1.18

Erasing Weak Echoes

Sediment in the water or reflections from plankton may be painted on the display in
low intensity tones, as shown in the illustration below. You can remove these unwant-
ed echoes with the color erase feature.
1. Press the MENU/ESC key, then open the [Setting], [External fish finder] or [Tele-
sounder] tab.
Interference from
other sounder
Electrical interference
Weak echoes
1. OPERATION
Interference
Off
Low
Medium
High
Auto
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