Sea state (external weapon traverse thru X,Y and Z ---pitch, roll and yaw---axises), shell spin (like a golf hook or slice--depending on internal rifleing---also dependent on rifleing wear), distance to the target, wind speed and direction, humidity and target aspect/speed/distance/course...as well as your own... (not to mention shell throw weight, atmospheric friction, exclusive of humidity, and, powder load/quality/consistancy) effect initial aim point as well. Not sure how sophisticated the deck gun model is...but each of those factors play a part in real life. Given that...aim for where the target will be when the round arrives...not where he is when you squeeze the trigger (lead or lag...depending). That may solve at least a part of the problem. Same things, in general, Michael Jordon caculated when (as) he shot a running three-pointer in the NBA.
Now you know why they mandate both geometry and physics at the Academy.
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