I have no idea, really. I think the flags are very difficult to read in even good conditions. Forget about night or in bad weather.
Though, the way I learned to play, I did a lot of distance shooting. And that's not really what U-Boats did. So yeah, maybe you just have to go up to them, knock on their hull and ask, 'Are you the enemy?'
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Type VIIB = The Truth
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