mission coordinates/levels?

I seem to have a technical problem, either not finding what figures to change or what button to engage:
1st, I've been making airfields for WWI CFS1, even modified one of the stock textures which showed up in the sim near one of the coordinates I wanted (in WWI there weren't many permanent "aerodromes" and most were simply the available dirt/grass fields). I then place tents and trees, sometimes buildings, around the area as needed. I copy down the string (e.i. units ) of objects for that location and keep them in a seperate text folder (unit & ID numbers may need changing whenever used in another sim). However, when I run the sim, the distance from one location to the next seems to be short of what it should be (maybe @1/2?). It's either that or the scale is wrong on the maps I'm using ; what's the distance (miles, kilometer, feet... whatever, as long as I know which units are given) per degree (east/west) at latitude 50 and per degree (north/south) at longitude 2 (not that it should be significantly different at any other longitiude along latitude 50 on our not-truly-round world). Or is there a 'reality' selection I've never found?
**(see 3rd paragraph)2nd, I have a mission that works when all aircraft are listed for rookie (level=0) but fails to operate should any be listed for veteran (level=1) or ace (level=2). I've had others that worked with such changes (level 1 or 2 planes only showed up when veteran/ace was selected; with the '0' they're always there).**
** Thanks to DaveCumming for the probable answer to the *2nd* part in another post. As for the 1st, I'm still not sure but the information may have been wrong in the source. I haven't actually been to France so I don't know the actual distance between Bertangles and Cappy; driving distance is undoubtedly different than flying distance (unless flown by a drunk crow) so I'm not sure which was given.
1st, I've been making airfields for WWI CFS1, even modified one of the stock textures which showed up in the sim near one of the coordinates I wanted (in WWI there weren't many permanent "aerodromes" and most were simply the available dirt/grass fields). I then place tents and trees, sometimes buildings, around the area as needed. I copy down the string (e.i. units ) of objects for that location and keep them in a seperate text folder (unit & ID numbers may need changing whenever used in another sim). However, when I run the sim, the distance from one location to the next seems to be short of what it should be (maybe @1/2?). It's either that or the scale is wrong on the maps I'm using ; what's the distance (miles, kilometer, feet... whatever, as long as I know which units are given) per degree (east/west) at latitude 50 and per degree (north/south) at longitude 2 (not that it should be significantly different at any other longitiude along latitude 50 on our not-truly-round world). Or is there a 'reality' selection I've never found?
**(see 3rd paragraph)2nd, I have a mission that works when all aircraft are listed for rookie (level=0) but fails to operate should any be listed for veteran (level=1) or ace (level=2). I've had others that worked with such changes (level 1 or 2 planes only showed up when veteran/ace was selected; with the '0' they're always there).**
** Thanks to DaveCumming for the probable answer to the *2nd* part in another post. As for the 1st, I'm still not sure but the information may have been wrong in the source. I haven't actually been to France so I don't know the actual distance between Bertangles and Cappy; driving distance is undoubtedly different than flying distance (unless flown by a drunk crow) so I'm not sure which was given.