Here is a very specific problem :
I have some mercator flight simulator maps I projected with real coordinates. However, due to game simplification, these maps are not oriented correctly and real bearings don't correspond to ingame ones.
But my flight plan tool need to display ingame bearings to be accurate and useful !
So, is there a way, or a mathematic function allowing me to recalculate ingame bearings from the map projection, when the figure is in the map bounding box ?
I have the WGS84 coordinates of the 4 corners, and maps are always perfectly oriented NSEW ingame.
I can imagine there could be some maths in the solution.