Humminbird 161 - Manual (Page 41)

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Sensitivity
Sensitivity controls how much detail is shown on the
display and will adjust the sensitivity of all sonar frequencies. Increasing the sensitivity
shows more sonar returns from small baitfish and suspended debris in the water;
however, the display may become too cluttered. When operating in very clear water or
greater depths, increased sensitivity shows weaker returns that may be of interest.
Decreasing the sensitivity eliminates 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.
To adjust the Sensitivity:
1. Highlight Sensitivity on the Sonar X-Press TM menu.
2. Use the LEFT or RIGHT 4-WAY Cursor Control keys to increase or decrease the
Sensitivity setting. (Low = 1, High = 20, Default = 10)
Sensitivity at Low Sensitivity at Medium Sensitivity at High