The green line is the path the torpedo will take if fired at that exact moment, with the range/speed/AOB you have entered for the target. The white X is where the position keeper is showing the ship to be; if the X is not on the target them something is incorrect. Since a torpedo must aim farther ahead to hit the target when it's on slow speed than on fast speed, changing torp speed will alter the path. As to why torpedoes miss, assuming all your data is correct, the torpedo will only hit if the target continues on the exact same heading at the exact same speed for the entire run of the torpedo. If the target speeds up, slows down, or turns even slightly, it can put the target ship out of the path of the torpedo and you miss. The closer you are, the less time there is for a reaction and so the higher your chances of hitting.
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We, the unwilling, led by the unknowing, are doing the impossible for the ungrateful. We have done so much, for so long, with so little, that we are now qualified to do anything with nothing.
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