Humminbird 596C HD DI - Manual (Page 58)

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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.
Bottom Range
(Sonar Zoom View only when Bottom Lock is On)
Settings: 10 to 60 feet, 2 to 10 fathoms, or 3 to 20 m
[International Models only], Default = 15
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.
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