Humminbird HELIX 5 SONAR Operation Manual page 60

Sensitivity controls how much detail is shown on the display and will adjust the sensitivity of all
sonar frequencies.
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.
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.
NOTE: The Sensitivity setting is a global setting and will adjust the sensitivity of all sonar frequencies.
Upper Range sets the shallowest depth range that will be displayed on the Sonar, Split Sonar,
Circular Flasher, Big Digits, and Down Imaging/Sonar Combo Views. Upper Range is often used
with Lower Range.
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.
NOTE: A minimum distance of 10 feet will be maintained between the Upper and Lower Range
regardless of the manual settings entered.
The available Upper Range settings are determined by your Humminbird model as follows:
• HELIX 5 SONAR: 0 to 1490 feet or 0 to 454 meters; Default = 0
• HELIX 5 DI: 0 to 590 feet or 0 to 180 meters; Default = 0
• HELIX 7 SONAR: 0 to 1490 feet or 0 to 454 meters (International Models only); Default = 0
• HELIX 7 DI: 0 to 590 feet or 0 to 180 meters (International Models only); Default = 0
Flasher X-Press Menu
Sensitivity
Settings: Low = 1, High = 20; Default = 10
Upper Range
(Advanced)
Settings: Various, see below.
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