Garmin Software Version 0563.32 Guide de l'utilisateur Page 130

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Garmin G1000 Cockpit Reference Guide for the Cessna Nav III
190-00384-13 Rev. B
112
Abnormal Operation
Flight
InstrumentsEIS
Nav/Com/
XPDR/AudioAFCSGPS Nav
Flight
PlanningProcedures
Hazard
Avoidance
Additional
Features
Abnormal
Operation
Annun/
AlertsAppendixIndex
DR Mode is inherently less accurate than the standard GPS/SBAS Mode due to the
lack of satellite measurements needed to determine a position. Changes in wind speed
and/or wind direction compounds the relative inaccuracy of DR Mode. Because of this
degraded accuracy, the crew must maintain position awareness using other navigation
equipment until GPS-derived position data is restored.
Dead Reckoning Indications
Symbolic Aircraft
(Map pages and Inset Map)
CDI ‘DR’ Indication on PFD
As a result of operating in DR Mode, all GPS-derived data is computed based upon
an estimated position and is displayed as yellow text on the display to denote degraded
navigation source information. This data includes the following:
Navigation Status Box fields except Active Leg, TAS, and DTK
GPS Bearing Pointer
Wind data and pointers in the Wind Data Box on the PFD
Track Indicator
All Bearing Pointer Distances
Active Flight Plan distances, bearings, and ETE values
Also, while the G1000 is in DR Mode, the autopilot will not couple to GPS, and
Terrain Proximity, TERRAIN-SVS, and TAWS are disabled. Additionally, the accuracy
of all nearest information (airports, airspaces, and waypoints) is questionable. Finally,
airspace alerts continue to function, but with degraded accuracy.
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