Humminbird 787c2i - Manual (Page 77)

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Bottom Lock
(Sonar Zoom view only)
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.
To turn on Bottom Lock:
1. In the Sonar Zoom View, highlight Bottom Lock on the Sonar X-Press™
Menu.
2. Use the LEFT or RIGHT 4-WAY Cursor Control keys to change the
Bottom Lock setting to on. (Off, On, Default = Off)
Bottom Range
(Sonar Zoom view only when Bottom Lock is On)
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. 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.
To adjust the Bottom Range:
1. In the Sonar Zoom View, highlight Bottom Lock on the Sonar X-Press™
Menu.
2. Use the LEFT or RIGHT 4-WAY Cursor Control keys to change the
Bottom Lock setting to on.
3. Once you turn on Bottom Lock, the Bottom Range X-Press™ menu
choice will be displayed. (10 - 60 feet, 2-10 fathoms, or 3-20 meters
[International Models only], Default = 15 feet)