One thing to note though is that if you are moving this can throw off the results if you are not at a 90AOB. I always go to full stop before an attack anyways (I'm an ideal Sub captain
) That is, if I'm attacking a moving target. Most of my sinkings are from sneaking into big ports like Singapore, Bankok, etc and sinking the merchants there. I find more pleasure in sneaking past DD guards to the goods and sometimes the tonnage is amazing!.