I love those old training movies. I'll try and save you some money as i think i understand what you're trying to achieve. Obviously you're aware that those a/c had navigators and the pilots just had to fly accurate speed and headings and call out the landmarks. The nav used a stopwatch to calculate ETA's.
In a tiggy in FS, most of the work is done on the ground before you take off. I first select landmarks which I know are in FS and then on a notepad jot down courses,turning points, elapsed times etc.
I used free addon scenery to provide landmarks that weren't in FS.
This is an example in FS9. I added in Flamboough Head, Whitby, Tyneside docks, York minster. Plotted the courses from my map and then flew the route.
It was fun because having added the landmarks, I'd set myself a treasure hunt to find them. To give myself an extra element of fun, I timed my departure from Sandtoft to ensure that i kept to time enroute and because it has no lights had to make it back before dark. If i got lost or didn't keep the speed up, i'd have to divert to Church Fenton.(which i did because i took too long starting the a/c
Here's the video of that trip (in a lanc of course) http://www.youtube.com/watch?v=ZtFR18VL3ac
BTW i find it impossible to manually fly an exact compass course, so if I'm off by a couple of degrees I apply a correction the other way for a similar time and that way I can fly fairly accurate legs without having to concentrate too much on the compass.
Two sites for FS freeware; http://www.avsim.com/ http://simviation.com/1/front-page
"Only birds and fools fly and even the birds don't fly at night"