=== Terrain related ===
* To check for wave conditions far from the original obstacle doesn't work well in Flightgear, because you can't rely on terrain far from your present location being loaded already. So by necessity one has to make it a more local phenomenon.
* provide an option to decouple terrain loading from visibility, so that geodinfo and the terrain presampler can also query terrain which is invisible [https://code.google.com/p/flightgear-bugs/issues/detail?id=848&sort=-id&colspec=ID%20Type%20Status%20Priority%20Summary%20Aircraft%20Milestone].
=== Environment related ===