Humminbird 858c Combo, Installation And Operation Manual

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96 Down Imaging ™ X-Press ™ Menu
Down Sensitivity
Settings: Auto, 1 to 20, where Low = 1,
High = 20, Default = 10
Down Sensitivity controls how much detail is shown on the display.
Increase the Down Sensitivity to reveal weaker returns that may be of
interest, especially in very clear water or greater depths. A high Down
Imaging™ Sensitivity setting shows more sonar returns from small baitfish
and suspended debris in the water; however if the Down Imaging™
Sensitivity is adjusted too high, the display may become too cluttered.
Decrease the Down Sensitivity to eliminate the clutter from the display that
is sometimes present in murky or muddy water. If Down Imaging™
Sensitivity is adjusted too low, the display may not show many sonar returns
that could be fish.
Upper Range
(Advanced: Down Imaging ™ Views only)
Settings: 0 to 1490 or 0 to 497 meters
[International models only], Default = 0
Upper Range sets the shallowest depth range that will be displayed on the
Down Imaging™ Views. Upper Range is often used with Lower Range.
NOTE: A minimum distance of 10 feet will be maintained between the Upper and
Lower Range regardless of the manual settings entered.
For example, if you are only interested in the area between 20 and 50 feet
deep, you should set the Upper Depth Range to 20 and the Lower Depth
Range to 50. The Down Imaging
™ View will then show the 30 foot area
between 20 and 50, and will not show the surface or the bottom (assuming
the bottom is deeper than 50 feet), and will show greater detail for that
area between 20 and 50 feet.