Honestly I find this is very seldom a problem. I'm running GWX. I've been playing for years, and I've probably accidentally sunk less than 5 neutrals, and never a friendly.
Very early in the war you have to watch out as you can run into neutrals anywhere. But by 1940, you can pretty much guarantee the friend-or-foe status simply by where you are when you encounter them.
Anything around Britain is likely an enemy. Any sizable convoy is probably an enemy.
When you run south from Spain downwards you need to pay more attention, but neutrals that you encounter will likely be single ships or very small convoys. Single ships are easy to stalk and figure out who they are.
Anything running with lights on is neutral.
Steve
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