GNC 420(A) Pilot’s Guide and Reference
9-20
SECTION 9
AUX PAGES
9.4 SETUP 1 PAGE
The Setup 1 Page provides access (via menu options)
to airspace alarms,
CDI scale adjustment, an
arrival alarm,
units of measure settings, position formats, map datums,
and settings for local or UTC time display. When a
menu option is selected, the corresponding page appears
providing access to the various unit settings.
Selecting a menu option from the Setup 1
Page:
1) Press the small
right
knob momentarily, to
activate the flashing cursor (Figure 9-51).
Figure 9-51 Setup 1 Page
Current Page Group
Menu Options (to Select, Highlight
with Cursor and Press the
ENT
Key)
Position of
Current Page
within Current
Page Group
Number of Pages in
Current Page Group
2) Turn the large
right
knob to select the desired
menu option (Figure 9-52), and press the
ENT
Key (Figure 9-53).
Figure 9-52 ‘Units/Mag Var’ Highlighted
Figure 9-53 Units/Mag Var Page
The following menu options are available:
• ‘Airspace Alarms’ - Allows the pilot to turn the
controlled/special-use airspace message alerts on
or off. This does not affect the alerts listed on the
Nearest Airspace Page or the airspace boundaries
depicted on the
Map Page. It simply turns on/off
the warning provided when approaching or near
an airspace.
An altitude buffer is also provided which ‘expands’
the vertical range above or below an airspace.
For example, if the buffer is set at 500 feet, and
the aircraft is more than 500 feet above or below
an airspace, the pilot is not notified with an alert
message; if the aircraft is less than 500 feet above
or below an airspace and projected to enter it, the
pilot is notified with an alert message. The default
is 200 feet.
• ‘CDI/Alarms’ - Allows the pilot to define the scale
for the GNC 420’s on-screen course deviation
indicator. The scale values represent full scale
deflection for the CDI to either side (Figure
9-54). The default setting is ‘Auto’. At this
setting, the
CDI scale is set to 5 nm during the
enroute/oceanic phase of flight. Within 30 nm
of the destination airport the
CDI scale gradually
ramps down to 1.0 nm (terminal area). Likewise
when leaving the departure airport the
CDI scale
is set to 1.0 nm and gradually ramps UP to 5 nm
beyond 30 nm (from the departure airport).
190-00140-20 Rev. K
Summary of Contents for GNC 420
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