It is called the
Thermalizer. It is actualy an aplication that when used like the read me says it changes the thermal layers in the game so that they change acording to the time of year so the thermal layers are not always the same in the game.
I have been using this mod for ages it seems and just stumbled on it again in searches.
People might be interested in this for their own games.
http://www.subsim.com/radioroom/show...02&postcount=1