GAD 29B?
I too have a question about the GAD 29. I'm building a typical Garmin G3X system in my RV-10, and I purchased a GAD 29 unit from an individual that has part number 011-03236-01. It says 'FAA-PMA', and Googling this number seems to indicate it's a GAD 29B. This particular model supposedly has extra circuitry to support an analog autopilot. There is no result on the Garmin site when searching for this part number.
The basic question is this: Can I use this particular GAD 29 with my Experimental G3X system and a Garmin Navigator, probably a 650Xi, with a G5 and Garmin autopilot?