The annunciations listed in the following table can appear on the HSI when abnormal GPS conditions occur. FMS navigation will resume automatically once a valid GPS solution is restored (and GPS sensors have not been inhibited). Refer to the Flight Management Abnormal GPS Conditions Section for more information on abnormal GPS conditions and Appendix A for abnormal GPS condition annunciations.

Table 9: Abnormal GPS Conditions Annunciated on HSI

Annunciation	Location on HSI	Description
	Upper left quadrant of HSI	Loss of Integrity Monitoring — GPS integrity is insufficient for the current phase of flight.
	Below HSI	Integrity OK — GPS integrity has been restored to within normal limits (annunciation displayed for 5 seconds).
	Lower right quadrant of HSI	Dead Reckoning — System is using projected position rather than GPS position to compute navigation data and sequence active flight plan waypoints.

It is important to note that estimated navigation data supplied by the system in DR mode may become increasingly unreliable and must not be used as a sole means of navigation. Refer to the Dead Reckoning Mode section in Flight Management for more information about DR mode.