190-00709-00 Rev. A
Garmin G1000 Pilot’s Guide for the Socata TBM 850
2-35
FLIGHT INSTRUMENTS
2.4 ABNORMAL OPERATIONS
ABNORMAL GPS CONDITIONS
The annunciations listed in Table 2-4 can appear on the HSI when abnormal GPS conditions occur; see Figure
2-51 for examples. Refer to the Flight Management Section for more information on Dead Reckoning Mode.
Annunciation
Location
Description
LOI
Lower left of
aircraft symbol
Loss of Integrity Monitoring–GPS integrity is insufficient for the current
phase of flight
WARN
Lower left of
aircraft symbol
Warning–RAIM function detects excessive GPS position errors
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
Dead Reckoning–System is using projected position rather than GPS position
to compute navigation data and sequence active flight plan waypoints
Table 2-4 Abnormal GPS Conditions Annunciated on HSI
Figure 2-51 Example of HSI Annunciations
Dead Reckoning Mode causes the CDI to be removed from the display (when GPS is the selected navigation
source) and the following items on the PFD to be shown in yellow:
• Current Track Bug
• Wind Data (calculated based on GPS information)
• Distances in the Bearing Information windows
• GPS bearing pointers
These items should be verified when operating in Dead Reckoning Mode.
