8-31190-01004-03 Rev. F Garmin GTN 625/635/650 Pilot’s GuideForewordGettingStartedXpdr CtrlCom/NavFPLDirect-ToProcWpt InfoMapTrafflcTerrainWeatherNearestServices/MusicUtilitiesSystemMessagesSymbolsAppendixIndex8.4 CDI (GTN 650 only)The GTN 650's CDI key is used to select data that is sent from the GPS orVLOC receiver to the external CDI (or HSI). CDI selection is available on theDefault Navigation page. When the external CDI (or HSI) is connected to theGPS receiver, “GPS” is shown on the annunciation bar. When the external CDI(or HSI) is being driven by the VLOC receiver, “VLOC” appears instead.NOTE: The VLOC receiver must be selected for display on the external CDI/HSI for approaches which are not approved for GPS. See the ILS examplein the Procedures section for more information.NOTE: GPS phase of flight annunciations (LPV, ENR, etc.) are not applicableto the external CDI (or HSI) when VLOC is active.NOTE: The internal on-screen CDI information is based on GPS data andcannot be used for primary navigation.NOTE: If the unit is not configured for a CDI key, then the “activate GPS missedapproach” will only resume automatic waypoint sequencing. The user mustswitch to GPS navigation, if desired, by using their external source selectionmethod (this is typical an EFIS system).1. The navigation source is shown in the center of the annunciationbar at the lower part of the display.Touch CDIKey To ToggleNavigationSourceTouch To AccessMap PageNavigationSourceAnnunciationCDI DisplayTouch OBSKey To ToggleOBS ModeGPS LevelOf ServiceTouch To Edit FPLFigure 8-40 Navigation Source Selection2. Touch the CDI key to toggle between sources.
