7Getting StartedAnnunciationsData Flag DescriptionNo valid position information is available from the source. Do not expect a valid positionrepresentation on the maps.No valid route (flight plan) is available from the external navigation source. Route (flightplan) information will not be shown on the maps.No valid altitude information is available from the external source. Altitude related func-tions will not operate, such as terrain awareness.No traffic information is received from the optional traffic sensor. Traffic will not bedisplayed.The GPS receiver in the GDL 90 UAT is not reporting a valid position. ADS-B broadcastwill not include a valid position report.No valid lightning detection information is being received from the optional Stormscopesensor. Strike and cell information will not be displayed.Terrain coverage is not available for some part of the terrain advisory coverage area.Terrain advisories may not be provided.When connected to the SL30, indicates the SL30 is not available or valid. ILS, OBS, andVORs will not be highlighted.Indicates that radar status information is not available from the optional external radartransmitter head. Radar related functionality may not be available.(Green)Indicates that the radar is ON and transmitting RF energy. Appropriate precautionsshould be taken.(Green Flashing)Indicates that the radar is in Hold and is transmitting RF energy. Appropriate precau-tions should be taken.(Green)Displayed when the GDL 90 is in Ident mode.No valid terrain information is available from the optional external source.No valid datalink information is available from the optional external source.All data flags are yellow, except as noted.
