[delvpier]

Google uses WGS-84 too... this is a geodetic system (someone call datum), not a projection.

I believe Il2 maps are not projected, but represented as a ellipsoid part (roughly saying, "as is") This is due when you flying earth is not plane, but curved as you flying above an sphere (or ellipsoid).

As real coordinates are not represented in IL2 maps, we can't determine what projection or datum this uses. But i believe earth's curvature is so exagerated in IL2 (you can see earth spherical at 5000 m for example, and this is not true).

Absolutely right !

Those kind of things would be more documented if someone could decompile the Java code and make it readable...