
Garmin G1000 Cockpit Reference Guide for the Cessna 350/400
190-00567-01 Rev. B
SECTION 11 – ABNORMAL
OPERATION
11-3
NOTE: Dead Reckoning Mode will only function in
Enroute (ENR) or Oceanic (OCN) phase of flight.
In all other phases, an invalid GPS solution will
produce a “NO GPS POSITION” annunciation on
the map and the G1000 will stop navigating in
GPS Mode.
DR Mode is indicated on the G1000 by the appearance
of the letters ‘DR’ superimposed in yellow over the ‘own
aircraft’ symbol as shown in Figure 11-4. In addition, ‘DR’
will be prominently displayed, also in yellow, on the HSI
slightly above and to the right of the aircraft symbol on the
CDI as shown in Figure 11-4. Also, the CDI deviation bar
is removed from the display. Lastly, but at the same time, a
‘GPS NAV LOST’ alert message will appear on the PFD.
Normal navigation using GPS/WAAS source data
will resume automatically once a valid GPS solution is
restored.
It is important to note that estimated navigation
data supplied by the G1000 in DR Mode may become
increasingly unreliable and must not be used as a sole
means of navigation. If while in DR Mode airspeed and/or
heading data is also lost or not available, the DR function
may not be capable of accurately tracking your estimated
position and, consequently, the system may display a path
that is different than the actual movement of the aircraft.
Estimated position information displayed by the G1000
through DR while there is no heading and/or airspeed
data available should not be used for navigation.
Figure 11-4 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 will be computed based upon an estimated position
and will be 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 and MFD
• Track Bug
• 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 both TAWS and Terrain Proximity
will be disabled. Additionally, the accuracy of all nearest
information (airports, airspaces, and waypoints) will be
questionable. Finally, airspace alerts will continue to
function, but with degraded accuracy.
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