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Garmin G1000 Pilot’s Guide for the Diamond DA40/40F
190-00592-06 Rev. A74
FLIGHT INSTRUMENTS
SYSTEM
OVERVIEW
FLIGHT
INSTRUMENTS
EIS
AUDIO PANEL
& CNS
FLIGHT
MANAGEMENT
HAZARD
AVOIDANCE
AFCS
ADDITIONAL
FEATURES
APPENDICESINDEX
2.4 ABNORMAL OPERATIONS
ABNORMAL GPS CONDITIONS
The annunciations listed in the table can appear on the HSI when abnormal GPS conditions occur. Refer to
the Flight Management Section for more information on Dead Reckoning (DR) Mode.
Annunciation Location Description
LOI
Lower left of
aircraft symbol
Loss of Integrity Monitoring–GPS integrity is insufficient for the current
phase of flight
INTEG OK
Lower left of
aircraft symbol
Integrity OK–GPS integrity has been restored to within normal limits
(annunciation displayed for 5 seconds)
DR
Upper right of
aircraft symbol
and PFD Inset
Map
Dead Reckoning–System is using projected position rather than GPS position
to compute navigation data and sequence active flight plan waypoints
Table 2-3 Abnormal GPS Conditions Annunciated on HSI
Figure 2-42 Example HSI Annunciations
In DR Mode the CDI is removed from the display when GPS is the selected navigation source. In addition, 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:
•NavigationStatusBoxeldsexceptActiveLeg,TAS,andDTK
•GPSBearingPointer
•WinddataandpointersintheWindDataBoxonthePFD
•TrackIndicator
•AllBearingPointerDistances
•ActiveFlightPlandistances,bearings,andETEvalues
These items should be verified when operating in Dead Reckoning Mode.
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.