Furuno FSV-75, Operator'S Manual

Page: 103 / 235

4. FISH FINDER MODE
4-5
4.8 How to Erase 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. Open the menu.
2. Select [6 Fish Finder], then left-click.
3. Select [5 Color Erase], then left-click.
4. Left-click the
S or T button to select the desired setting.
As the setting increases, reflections are removed in order, from
weakest to strongest.
5. Select [Quit], then left-click.
6. Close the menu.
4.9 How to Reject Low Level Noise (Clutter)
Low intensity “speckles” are referred to as clutter, and can appear over most of the
screen. Clutter is often caused by sediment in the water or noise. These unwanted
echoes can be rejected.
1. Open the menu.
2. Select [6 Fish Finder], then left-click.
Weak echoes
Low level noise (clutter)
appears as “speckles”
on the display.