Humminbird 700 SERIES 798CI - Manual (Page 146)

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Surface Clutter
(Advanced)
Surface Clutter adjusts the filter that removes surface clutter noise caused by
algae and aeration. The lower the setting, the less surface clutter will be
displayed. The Surface Clutter menu option is available when User Mode is set
to Advanced (see Main Menu: User Mode).
To change the Surface Clutter setting:
1. Make sure the User Mode is set to Advanced, then highlight Surface
Clutter on the Sonar main menu.
2. Press the LEFT or RIGHT Cursor keys to change the Surface Clutter
setting. (Low = 1 to High = 10, Default = 5)
Surface
Clutter
Surface Clutter
Sonar Menu Tab