If it's zig-zagging (although the whole zig-zag thing is a little unrealistic) just remember that the base course is unchanged, so you can keep your original solution and do the following check
a) if at close range (up tp 1500 yards) just wait until the target is coming on to present somthing like the expected AOB for the position...and fire
b) if at longer range you have to take into account that the net speed of the target will be a little slower - in this case move the target speed down one knot and fire a spread
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"Enemy submarines are to be called U-Boats. The term submarine is to be reserved for Allied under water vessels. U-Boats are those dastardly villains who sink our ships, while submarines are those gallant and noble craft which sink theirs." Winston Churchill
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