Garmin G2000 Cockpit Reference Manual page 126

Abnormal Operation
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.
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
• Current Track Indicator
• All Bearing Pointer Distances
• Active Flight Plan distances, bearings, and ETE values
Also, while the G2000 is in DR Mode, the autopilot will couple to GPS for up to 20
minutes. Terrain Proximity, TERRAIN-SVT, and TAWS are also disabled. Additionally,
the accuracy of all nearest information (airports, airspaces, and waypoints) is
questionable. Finally, airspace alerts continue to function, but with degraded accuracy.
110
Garmin G2000 Cockpit Reference Guide for the Cessna Corvalis T240
Dead Reckoning Indications
FMS 'DR' Indication on PFD
190-01264-01 Rev. A