Humminbird 778C - Manual (Page 77)

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Zoom Width
Settings: Narrow, Medium, Wide; Default = Narrow
Zoom Width adjusts the width of the Zoom window on the Sonar Zoom View.
50 kHz Sensitivity
(Advanced, XD Sonar only [778c HD XD])
Settings: -10 to +10; Default = 0
50 kHz Sensitivity changes the sensitivity of the 50 kHz beam. Increasing the
50 kHz Sensitivity will display additional weak returns, and decreasing the
50 kHz Sensitivity will display fewer weak returns.
NOTE: 50 kHz Sensitivity is particularly useful for adjusting the sensitivity of the
50 kHz sonar returns in the 200/50 kHz Split Sonar View. The 50 kHz sensitivity can
be adjusted without affecting the sensitivity of the 200 kHz returns shown in the
200 kHz sonar window.
83 kHz Sensitivity
(Advanced, DualBeam PLUS™ Sonar only [778c HD])
Settings: -10 to +10; Default = 0
83 kHz Sensitivity changes the sensitivity of the 83 kHz beam. Increasing the
83 kHz Sensitivity will display additional weak returns, and decreasing the
83 kHz Sensitivity will display fewer weak returns.
NOTE: 83 kHz Sensitivity is particularly useful for adjusting the sensitivity of the
83 kHz sonar returns in the 200/83 kHz Split Sonar View. The 83 kHz sensitivity
can be adjusted without affecting the sensitivity of the 200 kHz returns shown
in the 200 kHz sonar window.
455 kHz Sensitivity
(Advanced, with optional-purchase
QuadraBeam PLUS™ transducer)
Settings: -10 to +10; Default = 0
455 kHz Sensitivity adjusts the sensitivity of the 455 kHz beam. Increase the
sensitivity to display additional weak returns and decrease the sensitivity to
display fewer weak returns.
Sonar Menu Tab