Hello Mav,
Thank you for choosing the G3X Touch system for your aircraft. In answer to your question, if you connect a GNS 430 to your G3X Touch system via RS-232 only, without connecting the ARINC 429 interface, you will receive basic flight plan and VFR navigation data, but you will not have enough information displayed on your G3X Touch PFD for IFR navigation. In either case, the G3X Touch flight director and GSA 28 autopilot servos can still be used in GPS NAV mode to follow an external flight plan provided by the GNS 430, although without ARINC 429 data the roll steering guidance is more limited. We do recommend installing the ARINC 429 interface in order to access all the information your GNS 430 can provide, as well as to provide a way for your G3X Touch system to provide data to it, including baro setting.
- Matt
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Garmin G3X Support
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