Imaging Frequency (859Ci Hd Di, 959Ci Hd Di, 899Ci Hd Si, And 999Ci Hd Si Only); Surface Clutter; Switchfire - Humminbird 800 series Operation Manual

Imaging Frequency
(859ci HD DI, 959ci HD DI, 899ci HD SI and 999ci
HD SI only)
Settings: 800 kHz, 455 kHz; Default = 455 kHz
Imaging Frequency allows you to select which frequency to apply to the
Down Imaging® and Side Imaging® beams (455 kHz or 800 kHz). For the best
overall image quality and depth, select 455 kHz. For the sharpest image (but
limited depth capability), select 800 kHz.
Down Imaging® Beams
455kHz
75 Degree Total Coverage
45°
800kHz
75°
16°
455kHz
28°
200kHz
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.
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Surface Clutter

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