Ok i figured out a way to do step (11) in that pdf mathematically without using scales to figure out how far along to draw A line Z-Y.
Instead of drawing A-B where it shows on that moboard... you instead draw it with A centered at P2.
then you take the vector length of Z-P2 divided by the vector length of Ownship-B.... to get a ratio to multiply the relative distance to get the actual distance.
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