Humminbird 700 SERIES 798CI - Manual (Page 112)

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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.
NOTE: The Sensitivity setting is a global setting and will adjust the sensitivity of all
sonar frequencies, as compared to specific sensitivity adjustments (such as 83 kHz
Sensitivity or 455 kHz Sensitivity) which allow you to adjust the level of sensitivity
for one specific beam at a time.
To adjust the Sensitivity:
1. Highlight Sensitivity on the Sonar X-Press™ Menu.
2. Press the RIGHT or LEFT Cursor keys to increase or decrease the
Sensitivity setting. (Low = 1, High = 20, Default = 10)
Sensitivity at Low Sensitivity at Medium Sensitivity at High
Sonar X-Press™ Menu