Humminbird Fish Finder 409000-1 User Manual

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Sonar X-Press™ Menu
Sensitivity
Settings: Low = 1, High = 20; Default = 10
Sensitivity controls how much detail is shown on the display and will adjust
the sensitivity of all sonar frequencies.
Decrease the sensitivity to eliminate the
clutter from the display that is sometimes
present in murky or muddy water. If
Sensitivity is adjusted too low, the display
may not show many sonar returns that
could be fish.
When operating in very clear water or
greater depths, increase the sensitivity to
see weaker returns that may be of interest.
If the sensitivity is adjusted too high, the
display may become too cluttered.
NOTE: The Sensitivity setting is a global setting
and will adjust the sensitivity of all sonar
frequencies.
.
Upper Range
(Advanced: Sonar, Split Sonar and
Active Sonar Side 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
Sonar, Split Sonar, and Active Sonar Side 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.
Sensitivity at Low
Sensitivity at Medium
Sensitivity at High
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 Sonar 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.

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