[Sigurd]

Ok, I just did a little work, and I think I managed to come up with something. It does involve Sines and inverse sines, so grab a calculator. I dont have the ability to check to see if this works, but here it goes:

Let:
l be the length of the target ship
d be the range to the ship
S be the spread angle
a be AoB

Then:
S = Sin ^-1 ((sin d * l)/d)

Sin^-1 is the inverse sin for those who arent aware. Should this formula work, a table could be easily generated. The only real requirement for this is that both 'l' and 'd' must be the same unit (i.e. meters).