[razark]

I'd suggest firing a spread. Not only does it give you a better chance at hitting a target, it's realistic. Sub skippers didn't have a way to check their speed, range, and AoB estimates easily, they didn't have complete or even accurate information on their target, and firing a spread was a good way to maximize the chance of getting a hit.

I remember reading something about the doctrine being used. They would estimate the length of the target, determine the spread for one and a half the target length, and fire the spread. It guarantees that there will be some misses, but the chance of getting a hit is greater.