Mark, I still havnt got it yet. But I have reason to believe the Flight 1 GTN 750, which I own, will work as a GPS and tie in with the autopilot?

I used the GTN 750 in the L1011 (my favourite!) to navigate. It uses the Hdg. mode in the Tristar, to follow the lateral route.

Of course, I may be wrong, in which case, the old VOR Nav is the authentic way to go, since this aircraft is an early 737. :) More of a pilots machine, less of a computer with wings!

Cheers,
David.