Garmin G3X Pilots Guide - Page 97

System Overview Flight Instruments Flight Instruments Switching between internal and external flight plan sources:  From the Active Flight Plan Page or the Direct-to Page, touch the INTERNAL or EXTERNAL Softkey to switch between the internal and external flight plan sources when an external GPS Navigator is configured. Failure of the External GPS Navigation Source If the external GPS navigation source fails, the system reverts to the internal GPS navigation source and 'REV' is shown in yellow in the upper left corner of the Data Bar as well as the lower left quadrant of the HSI. External GPS Failure. Reverted to Internal GPS EIS CNS Interface GPS Navigation Flight Planning Hazard Avoidance Additional Features Integrated Autopilot Annun/Alerts Appendix Index REV: External Navigation Source failed. Reverted to internal VFR GPS for navigation. External GPS Navigation Failure 190-01115-00 Rev. F Garmin G3X Pilot's Guide 79