Garmin G3X Pilot’s Guide 190-01115-00 Rev. K14System OverviewSystemOverviewFlightInstrumentsEISCNSInterfaceGPSNavigationFlightPlanningHazardAvoidanceAdditionalFeaturesAFCSAnnun/AlertsAppendixIndexS eleCtion Between Multiple navigatorSThe G3X CDI SRC Softkey (refer to Section 1.7) becomes available when more thanone source of navigation data is configured. The CDI SRC Softkey toggles betweenthe available navigation sources (e.g., between the internal G3X GPS and externalSL30 VLOC sources, between an SL30 and a GNS 430, or between two GNS 430s, etc).Refer to the Flight Instruments section for more information.uSing MapMX Serial Data input ForMatWhen using a WAAS enabled external GPS navigator (i.e., GNS 430W/530W, GNS480 or any GTN Series navigator), and configuring an RS-232 input for ‘MapMX’instead of ‘Aviation In’, a more accurate depiction of the flight plan legs are displayedon the moving map (i.e., holds, procedure turns, etc). Non-WAAS external navigatorsdo not support MapMX. Refer to the G3X Installation Manual for more information.EXTERNAL GPS NAVIGATOR FAILUREIn the event that all configured external GPS navigators fail, the G3X reverts to itsinternal VFR GPS for navigation and flight plan modifications.AUTOMATIC FLIGHT CONTROL SYSTEM (OPTIONAL)The G3X can also communicate with Garmin GSA 28, Garmin GMC 305 andvarious third-party autopilot units. With the AFCS configured, the G3X issues pitchand roll steering commands to the autopilot unit. Refer to Section 9 (AFCS) for moreinformation.
