Pilot's Guide

190-01461-00 Rev. A
Garmin G1000 Pilot’s Guide for the Piper PA-44-180 Seminole
77
FLIGHT INSTRUMENTS
SYSTEM
OVERVIEW
FLIGHT
INSTRUMENTS
EIS
AUDIO PANEL
& CNS
FLIGHT
MANAGEMENT
HAZARD
AVOIDANCE
AFCS
ADDITIONAL
FEATURES
APPENDICES INDEX
2.4 ABNORMAL OPERATIONS
ABNORMAL GPS CONDITIONS
The annunciations listed in Table 2-3 can appear on the HSI when abnormal GPS conditions occur (Figure
2-40). 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
INTEG OK
Lower left of
aircraft symbol
Integrity OK–GPS integrity has been restored to within normal limits
(annunciation displayed for five 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 2-3 Abnormal GPS Conditions Annunciated on HSI
Figure 2-40 Example HSI Annunciations
In Dead Reckoning Mode the CDI is removed from the display when GPS is the selected navigation source.
The following items on the PFD are then shown in yellow:
• Current Track Bug
• Wind Data
• Ground Speed
• Distances in the Bearing Information Windows
• GPS bearing pointers
These items should be verified when operating in Dead Reckoning Mode as they become increasingly
inaccurate over time.