depth ranges, TruZoom displays a range equal to
one fourth the current depth range. The box at the
right side of the screen outlines the area to be
zoomed.
The 450TX shows Zoom range in conjunction with
the full depth range. The Zoom range is shown on
the left side of the screen and full range information
is shown on the right side of the display. The area
which is being enlarged by Zoom is indicated by the square box. Zoom can
either operate automatically, in which the Zoom range is constantly adjusted
to show the bottom, or manually, in which the user controls the location of
the Zoom range.
“Automatic” Zoom is especially
helpful when looking for
structure or bottom detail. The
“Automatic” Zoom keeps the
bottom in view even in quickly
changing terrain. “Manual”
Zoom provides detailed
information of any area from
the surface to the bottom.
In “Manual” Zoom, the Zoom
range does not move as the
terrain changes. To operate
Zoom, press MENU repeatedly
until the Zoom menu is on-
screen. Three options are available: “Off” (Factory
Setting), “Auto” (Automatic bottom tracking Zoom),
and “Manual” (User controlled Zoom range). Press
the DOWN ARROW once to highlight Auto or twice
to highlight Manual. If Manual is selected a submenu
will appear allowing manual zoom range
adjustment. When the menu disappears, full range
information is displayed on the right as always. The
square box indicates the Zoom range. In Auto Zoom,
the box will move vertically to remain in the general
18
USING THE 450TX
MENU FUNCTIONS
Upper Zoom Limit
Lower Zoom Limit
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