Did you get better results with the faster targets? As the method relies on range and bearing change to determine how much it moved across the line of sight. The set AOB is applied as a correction for movement along the line of sight. The wild results could be caused by the uboat making small course deviations. The medium cargo is the slowest I believe. So the speed is hidden in the noisy results I suspect. Because it is relying on range primarily, and that is inprecise at long distance, I do not put much faith in the notepad method either.
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