Garmin Flight Deck 100 User Manual

190-00728-04  Rev. A

®

95

Under normal conditions, the Altitude Alerting function is based on the Selected Altitude shown on PFD1

(Figure 2-9). If the MFD is operating in Reversionary Mode, the Selected Altitude shown on the MFD will be
used for Altitude Alerting instead. If the MFD has also failed, then Altitude Alerting will be based on the PFD
2 Selected Altitude.

The annunciations listed in Table 2-5 can appear on the HSI when abnormal GPS conditions occur. Refer to

the Flight Management Section for more information on Dead Reckoning (DR) Mode.

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

DR 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 and pointers in the Wind Data Box on the PFD

• Distances in the Bearing Information windows

• GPS bearing pointers

• Groundspeed

These items should be verified when operating in DR Mode.