Garmin GNC 420AW GPS Receiver User Manual


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2 - NAV PAGES
59
190-00356-00 Rev E
Dead Reckoning
Deadreckoningistheprocessofcontinuingnavi-
gation using your last known position and speed after
a loss of GPS navigation while on an active flight plan.
CAUTION: Navigation using dead reckoning is
therefore only an estimate and should not be
used as the sole means of navigation. Use other
means of navigation, if possible.
DeadreckoningbecomesactiveafteralossofGPS
position while you are navigating using an active flight
plan. A pop-up message will appear and you must
clear the message before continuing operation.
The ownship icon color is changed to yellow. The To/
FromagisremovedfromtheCDI.TheDeadReckon-
ingannunciator(DR)appearsontheleftsideofthe
map display when GPS position is unavailable and the
unitisinDeadReckoningmode.Allexternaloutputs
dependent on GPS position are flagged.
Terrain will be noted as not available and new terrain
advisory pop-ops will not occur. Traffic and Storm-
scope information will not be shown on the Map page,
but will continue to be available on their own dedi-
catedpages.XMweatherwillstillbeavailableonthe
Map page.
DeadReckoningmodewillcontinueuntilGPSposi-
tionisrestored,whenGPSnavigationisrestoredDead
Reckoningmodeisexited.TheDRannunciations
will be removed and GPS information will be used to
compute navigation related information for the current
flight phase.
DeadReckoningisonlyallowedinEnRouteand
Oceanic flight modes. If the unit is in a Terminal or
ApproachightmodewhenDeadReckoningtakes
place, “No GPS Position” will be displayed on the map
pages and all navigation data will be dashed. If you are
operatinginDeadReckoningmodeandatransitionto
Terminal or Approach flight modes would occur from
theprojectedDeadReckoningposition,DeadReckon-
ing mode will be discontinued. “No GPS Position” will
be displayed on the map pages and all navigation data
will be dashed.
Dead Reckoning
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