Furuno CH-270 - Manual (Page 84)

4. ECHO SOUNDER MODE
4-12
4.10.5 Suppressing clutter
Low intensity echoes, often caused by sediments in water, are painted on the screen as a
large number or random dots. This noise can be suppressed.
1. Press the [MENU] key to open the menu.
2. Press ▲ to choose MENU at the top of the screen.
3. Press ◄ or ► to choose the ES menu.
4. Press ▲ or ▼ to choose CLUTTER.
5. Press ► to open the dialog box.
6. Press ◄ or ► to choose 0, 1, 2 or 3 as appropriate. The higher the number (setting) the
weaker the echoes which are erased.
7. Press the [MENU] key to register your selection and close the menu.