XPLMMapProject

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XPLM_API void       XPLMMapProject(
                         XPLMMapProjectionID  projection,
                         double               latitude,
                         double               longitude,
                         float *              outX,
                         float *              outY);

Projects a latitude/longitude into map coordinates. This is the inverse of XPLMMapUnproject().

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