Garmin Beechcraft 200 Series Cockpit Reference Manual page 199

Estimated position information displayed by the system through DR while there is no
heading and/or airspeed data available should not be used for navigation.
DR Mode is indicated on the system by the appearance of the letters 'DR' superimposed
in amber over the 'own aircraft' symbol as shown in the following figure. In addition, 'DR'
is prominently displayed in amber on the HSI slightly above and to the right of the aircraft
symbol on the CDI as shown in the following figure. The CDI deviation bar remains,
but is removed from the display after 20 minutes in DR Mode. The autopilot will remain
coupled in DR mode as long as the deviation info is available (20 min.) Lastly, but at the
same time, a 'GPS NAV LOST' alert message appears on the PFD. Normal navigation using
GPS/SBAS source data resumes automatically once a valid GPS solution is restored.
CDI 'DR' Indication on PFD
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 compound the relative inaccuracy of DR Mode. Because of this degraded
accuracy, other navigation equipment must be relied upon for position awareness until
GPS-derived position data is restored.
As a result of operating in DR Mode, all GPS-derived data is computed based upon
an estimated position and is displayed as amber text on the display to denote degraded
navigation source information as shown in the following figure. If the VSD Inset is selected
on the MFD, 'VSD Not Available' will be displayed.
NOTE: GPS derived information will remain displayed in magenta (not amber)
on the Flight Plan Progress inset when operating in Dead Reckoning mode.
However, this information shall still be considered as degraded navigation
source information.
Also, while the system is in DR Mode, some terrain functions are not available.
Additionally, the accuracy of all nearest information (airports, airspaces, and waypoints)
is questionable. Finally, airspace alerts continue to function, but with degraded accuracy.
190-02040-01 Rev. B
Dead Reckoning Indications
Garmin G1000 NXi Cockpit Reference Guide for the Beechcraft 200/B200 Series
Abnormal Operation
Symbolic Aircraft
(Map pages and Inset Map)
175