XPLMMapUnproject

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XPLM_API void       XPLMMapUnproject(
                         XPLMMapProjectionID  projection,
                         float                mapX,
                         float                mapY,
                         double *             outLatitude,
                         double *             outLongitude);

Transforms map coordinates back into a latitude and longitude. This is the inverse of XPLMMapProject().

Only valid from within a map layer callback (one of XPLMMapPrepareCacheCallback_f, XPLMMapDrawingCallback_f, XPLMMapIconDrawingCallback_f, or XPLMMapLabelDrawingCallback_f.)