RW Canadian North 737-200c's have a mixture of old and new avionics. The 737-200C I fly when up north can even use a portable FMC that yes plugs in via a USB. Technology at your hands and custom to who ever is PIC of that particular flight. I think when I left 2 of with 2 more 737's where sched to be done that way. Should also note the new 737-300 in there fleet is also PIC custom. You would be amazed at what we do to the 737-200 series to keep them in top notch flight condition. you have to as there a critical lifeline in the Arctic. Bottom line in the sim to me the user should learn a bit about VOR NAV and then decide if they ant to go further  or sweet talk CS into giving a modern FMC over the PCDU. Yes I hate the PCDU ;D but im glad I learned her on the real 737-200C. Great knowledge to have as backup.