Surface Clutter; Switchfire - Humminbird 688ci HD DI Operation Manual

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.
SwitchFire® controls how the sonar returns are displayed in the Sonar Views.
Choose Max Mode to see only raw sonar returns on the display. When Max
Mode is selected, you will see the maximum sonar information available within
the transducer beam, so more fish arches and better jig tracking are shown.
Choose Clear Mode to see less clutter and more fish size accuracy on the
display. When Clear Mode is selected, the clutter is filtered, and sonar returns
are interpreted to provide more details about the objects within the transducer
beam, regardless of their location. In other words, a large arch on the display
means a large fish has been detected.
Sonar Menu Tab

Surface Clutter

Settings: Low = 1 to High = 10; Default = 5
Surface Clutter
SwitchFire®
Settings: Max Mode, Clear Mode; Default = Max Mode
116
Surface
Clutter