Humminbird 778C - Manual (Page 61)

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Bottom Range
(Sonar Zoom View only when Bottom Lock is On)
Settings: 10 to 60 feet, 2 to 10 fathoms, or 3 to 20 meters
[International Models only]; Default = 15 ft
Bottom Range allows you to control how much of the water column, measured
up from the bottom, is shown in the Sonar Zoom View. Choose a small value to
see low-lying bottom structure or details of the bottom return. Choose a larger
value to see large structure in deeper water.
NOTE: It is possible to set the Bottom Range to be greater than the depth. In this
case, you may see surface clutter in a wavy band that mirrors changes in the
depth.
Bottom Lock
(Sonar Zoom View only)
Settings: Off, On; Default = Off
Bottom Lock changes the mode of the zoomed view in the Sonar Zoom View.
Bottom Lock continuously graphs the bottom at a constant point on the display
regardless of changes in depth. This “flattens“ out the bottom contour, but is
effective at showing fish on or near the bottom.
Zoom Level
(Sonar Zoom View only)
Settings: 2x, 4x, 6x, 8x; Default = 2x
Zoom Level sets the magnification level for the Sonar Zoom View. Use Zoom to
see more detail in the bottom sonar returns that might be displayed close
together, such as those caused by fish suspended close to the bottom or within
structure.
Zoom Level is only available on the X-Press™ Menu from the Sonar Zoom View.
The Zoom Preview Box shows the section of the bottom that will be magnified.
NOTE: The Zoom Preview Box tracks the bottom and cannot be moved.
Sonar X-Press™ Menu