Humminbird 1158? combo, Product Manual

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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.
.
Sensitivity at Low
Sensitivity at Medium
Sensitivity at High
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Sonar X-Press ™ Menu