I have posted on some US sites (avionics market at least 10x bigger than Europe) about whether anyone is feeding a TAS605A from a GTX335, and got zero, zilch, no input at all. Perhaps this scenario is very rare now and everybody (well those few who have bought or upgraded to a TAS605A, which has not been out all that long) is feeding it from their panel mount WAAS GPS. In that case I would...