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Zoom
Another form of range control is Zoom. The Zoom menu allows three different settings; Zoom Off,
Zoom On, and BL or Bottom Lock. Zoom allows selection of various ranges for full screen
viewing, not necessarily including the surface. 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' to 480' depth range is used, the zoom
range will be 30', and if the 600' range is in use, the zoom range will be 60'.
To enable zoom, adjust the depth of the zoom range first using
the UP and DOWN Arrow buttons until the upper and lower limit
numbers correspond with the range you wish to view, then
enable Zoom using the ENTER button.
Once you are in Zoom, you may still 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.
The digital depth readout will continue to track the bottom even
when Zoom is enabled.
Bottom Lock is a function of Zoom, except the depth adjustment
is controlled automatically to view the area immediately above
the bottom. This is especially useful if you are looking for
structure or minor variations in terrain in areas of relatively flat
bottom terrain. To enable Bottom Lock, press ENTER until the BL is highlighted. The Zoom range
will be controlled by the current depth range, as in Zoom, and will be indicated on the Zoom
menu.