Jonny,
You hit the nail on the head. What I am looking into doing is writing a program that would convert from TZT Pro 4 to NN3D. At the very least, TZ P4 does support NN3D by exporting a route as a CSV, then loading that route onto NN3D via a card. What I am looking to do is to take that CSV and load it onto NN3D via N2K. I see the route PGNs, so I think I can do that.
You mentioned something exciting -- is there an SDK for TimeZero? I was unable to find it. I would really like to find a way to access the route without having to do an export.
-mike