We have all seen maps showing the boundaries of Fighter Command groups and sectors. Some of them (even original ones) are rather inaccurate. Besides the amalgamation of groups and sectors, it is also clear that these boundaries have changed during WW2.

I would like to know if there exists somewhere an exact description of group and sector limits (preferably providing geographical coordinates) - I am mainly interested in the spring 1943 period - and their evolutions.

Best wishes,