Garmin GNC 420AW GPS Receiver User Manual


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2 - NAV PAGES
30
190-00356-00 Rev E
Default NAV Page
TherstNAVpageisthedefault NAV page. This
page may be quickly selected from ANY page by using
the CLR key.
To select the NAV group and display the default NAV
page, press and hold the CLR key.
The default NAV page displays a graphic course
deviationindicator(CDI)acrossthetopofthepage.
UnliketheangularlimitsonaCDIcoupledtoaVOR
orILSreceiver,fullscalelimitsforthisCDIaredened
by a GPS-derived distance (2.0, 1.0 or 0.3 NM). By
default,theCDIscaleautomaticallyadjuststothe
desired limits based upon the current phase of flight:
en route, terminal area or approach.
Active Leg of
Flight Plan
User-
selectable
Data Fields
Course Deviation Indicator (CDI)
Page location in NAV
group or advisory
NOTE:
Approaching the FAF, the GNS 400W-series
unit automatically rescales in an angular fashion.
This allows the LPV approach to be flown identically
to a standard ILS. At 2.0 NM from the FAF, CDI scal-
ing is tightened from 1.0 to the angular full scale
deflection defined for the approach.
You may also manually select the desired scale set-
ting as outlined in the Aux Setup section.
ThegraphicCDIshowsyourpositionatthecenter
of the indicator, relative to the desired course (the
moving course deviation needle). As with a traditional
mechanicalCDI,whenyou’reoffcoursesimplysteer
toward the needle. The TO/FROM arrow in the center
of the scale indicates whether you are heading to the
waypoint (an up arrow) or if you have passed the
waypoint (a down arrow).
The following symbols are used—on the default
NAV page directly below the CDI—to depict the
“active leg” of a flight plan or direct-to:
Direct-To a Waypoint
Course to a Waypoint, or Desired
Course between Two Waypoints
Right Procedure Turn
Left Procedure Turn
Vectors-To-Final
DME Arc to the left
DME Arc to the right
Left-hand Holding Pattern
Right-hand Holding Pattern
DirectlybelowtheCDIappearstheactiveleg of
your flight plan, or the direct-to destination when
using the direct-to key. This will automatically
sequence to the next leg of your flight plan as you
reach each interim waypoint. If no flight plan or
direct-to destination has been selected, the destination
field will remain blank.
Default Nav Page
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