rhumbaflappy's FS Design Aids
O Luis Sa's Gmaps online:  Exploring Google Maps for FSX
O Alternate Gmaps online: Rhumba gmaps
O Discover clouded shorelines using Nasa magnetic resonance imagery: MagMaps
O DownLoad RhumbaMaps javascript files to run on your own computer: RhumbaMaps
MESH:

My DEM5 and DEM7 meshsets are worldwide, but the DEM8 set covers only the WW2 theatre
of war. Made primarily for CFS2, the mesh also works in FS2002, FS2004 and FSX. DEM5 is
LOD 5, DEM 7 is LOD 7, and DEM8 is LOD 8.

O SRTM-based world mesh files for CFS2: Mesh on SkyDrive
O SRTM-based world mesh files for CFS2 by map: MeshMap Download
O Alternate SRTM-based world mesh files for CFS2 by map: MeshMap Download


Helpful tools by others:
O Determine distances between lat-long points: The Great Circle Distance Calculator
O MapShaper is an online SHPfile smoother. It allows saving polygon files files as either polys or lines. MapShaper