190-02207-02 Rev. B GPS 175/GNX 375 Pilot’s Guide 2-41Get Started2.26.4 GPS AlertsThe following alert conditions can affect GPS accuracy.INDICATIONS FAULT TYPE CONDITIONYellow “LOI”annunciation. Loss of IntegrityIntegrity of the GPS position doesnot meet the requirements for thecurrent phase of flight. Occursbefore the final approach fix(if an approach is active).Unit invalidatesactive courseguidance.Annunciation isspecific to cause.Loss of NavigationAircraft is after the final approachfix and GPS integrity does not meetthe active approach requirements.Insufficient number of satellitessupporting aircraft position (i.e.,more than 5 seconds pass withoutadequate satellites to compute aposition).GPS sensor detects an excessiveposition error or failure that cannotbe excluded within the time toalert.On-board hardware failure.Yellow “No GPSPosition”annunciation.Ownship icon notpresentLoss of Position Unit cannot determine a GPSposition solution.
