Garmin G3X Pilots Guide - Page 25

System Overview Flight Instruments EIS CNS Interface GPS Navigation System Overview Changing the Navigation Source When an external navigator that supports both GPS and VOR/ILS capabilities (i.e., GTN or GNS Series) is selected, the external navigator's CDI Key is used to switch the G3X HSI between GPS and VOR/ILS navigation. Selection Between Multiple Navigators The G3X CDI SRC Softkey (refer to Section 1.7) becomes available when more than one source of navigation data is configured. The CDI SRC Softkey toggles between the available navigation sources (e.g., between the internal G3X GPS and external SL30 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 Format When using a WAAS enabled external GPS navigator (i.e., GNS 430W/530W), and configuring an RS-232 input for 'MapMX' instead of 'Aviation In', a more accurate depiction of the flight plan legs are displayed on the moving map (i.e., holds, procedure turns, etc). Non-WAAS external navigators do not support MapMX. Refer to the G3X Installation Manual for more information. EXTERNAL GPS NAVIGATOR FAILURE In the event that all configured external GPS navigators fail, the G3X reverts to its internal VFR GPS for navigation and flight plan modification. INTEGRATED AUTOPILOT (OPTIONAL) The G3X can also communicate with various third-party external autopilot units. With the Integrated Autopilot configured, the G3X issues pitch and roll steering commands to the external autopilot unit. Refer to Section 9 (Integrated Autopilot) for more information. Flight Planning Hazard Avoidance Additional Features Integrated Autopilot Annun/Alerts Appendix Index 190-01115-00 Rev. F Garmin G3X Pilot's Guide 7