2-38 GPS 175/GNX 375 Pilot’s Guide 190-02207-02 Rev. 1Get Started2.24.2 SBAS ProvidersNOTEOperating with SBAS active outside of the service area may cause elevatedEPU values to display on the status page. Regardless of the EPU valuedisplayed, the LOI annunciation is the controlling indication fordetermining the integrity of the GPS navigation solution.2.24.3 GPS Status AnnunciationsOnce the GPS receiver determines the aircraft’s position, the unit displays position,altitude, track, and ground speed data. GPS status annunciates under the followingconditions.PROVIDER SERVICE AREASEGNOS Most of Europe and parts of North Africa.GAGAN IndiaMSAS Japan only.WAAS Alaska, Canada, the 48 contiguous states,and most of Central America.ANNUNCIATION CONDITIONAcquiringGPS receiver uses last known position and satellite orbitaldata (collected continuously from satellites) to determinewhich satellites should be in view.3D Nav 3-D navigation mode. GPS receiver computes altitudeusing satellite data.3D Diff Nav 3-D navigation mode. Differential corrections from SBASprovider are in use.LOI Satellite coverage is insufficient to pass built-in integritymonitoring tests.SBAS supports wide area or regional augmentation through theuse of additional satellite broadcast messages.Tap this key and select from the list of providers.
