Humminbird Wide Vision - Manual (Page 24)

If you alter the depth range, Manual operation is automatically selected. This feature is valuable if you are
only interested in targets near the surface. The Wide Vision will always display the digital depth of the
water, regardless of whether the bottom is shown on the selected depth range.
Zoom
Another form of range control is Zoom. Zoom allows
selection of various ranges for full screen viewing, while
maintaining a view of the full range. By using the display to
view a smaller area, the effective display resolution is
increased, and the units ability to separate targets close
together is enhanced.
The zoom range is determined by the depth range in use
when Zoom is enabled. In shallow water, when the 15' or
30' depth range is used, the zoom range will be 7-1/2'. If
the 60' or 120' depth range is in use, the zoom range will
be 15', if a 180' - 480' depth range is used, the zoom range
will be 30', and if the 600' - 1000' range is in use, the zoom
range will be 60'.
To enable Zoom, adjust the horizontal lines to the depth of the zoom range using the UP and DOWN
arrow buttons, then enable Zoom using the ENTER button.
Once you are in zoom, refer to the preview area and adjust the depth of the zoom range by using the UP
and DOWN arrow buttons. The Zoom menu will not appear when an adjustment is made unless MENU is
pressed.