I am looking for my avionics and see that the Garmin GTX 335 transponder provides mode S, ADSB-Out, and GPS. My question is, how do you view the GPS? Does this transponder unit only work with EFIS? I do not want an EFIS. I plan to use good old steam gauges. I am unable to find information on how to display the GPS part of the unit and I can't find a means to write to Garmin to ask such questions.

Also, Is there a different solution? I'd really like to find a package that has com radio, txp, adsb, and a GPS bundled but it doesn't seem to be out there.