You'd think the Germans would have their own names for "Time", "Bearing" and "Range".
Other wise nice work. Am I correct in inferring that the circle will print out with a 15 cm diameter on a A3 sheet? If you put it in a portrait A3, you should have ample space to make it a 20cm circle. But the extra white space as it is right now might come in handy for side-line calculations.
Please make a version without Nazi swastika. It serves no purpose on this drawing. There is no historical correctness to be maintained.