Further to my last post (I tried to edit it but failed)

In the L1011, if you are using the F1 GTN 750 to navigate in LNav, you need to set the Navigation switch on the Glareshield to "ONS" (On-board Navigation System) and not FMS or VOR. The lateral navigation will then use the Heading Bug to steer the aircraft.

It does work well. Take a look at my video here (at 15 minutes):-

https://youtu.be/ffq_Prw92gU

In the CS 737-200 you need the GPS switch on (Glare Shield) and be in Heading Mode, then the F1 GTN 750 will use the heading bug to steer. (Also make sure the GTN 750 is set in GPS mode)

I don't think there is an FMC available for the CS 737-200. Since its intended to be an early version with CWS and VOR Nav... :)

A certain "other" company doing the 737-200c, uses the "Universal" FMC, which is actually out of a Dash 8? But their Auto throttle doesn't work properly and they have no Flight Directors? :o

Best Regards

David