I'd have to disagree with you J430. The entire idea of ultralights is keeping it simple. I don't have a radio in my aircraft let alone a transponder and I would not even consider ADSB. If I did, I wouldn't be able to get in the aircraft with all the extra gear and weight. If you want to go into GAAPs and International airports jump in a GA machine. If you want to go for a fly have some fun and not pay through the nose fly RAA. Thats why the AUF came about many years ago, lets not forget that and try and make us GA.
Adam.