Flags
I think in-game, all blacked out ships are fair game. I have never been "dinged" renown points for sinking a blacked out ship without identifying their nationality. However, I cannot count how many times I have tracked either convoys and/or individual ships for hours and come to find out once visible that they are neutral or friendly. Good practice for those of us that use no map contacts or 100% realism. Not to mention a good way to hone in on your Hydrophone tracking skills.
Normally, the usual neutral nations I run into the most is Ireland and Portugal and sometimes Spain. I think there is an exception to this. In early-mid 1940 in the North Sea I have run into French ships that are lit up that are usually 100km off the Norwegian coast. I have attacked and sunk these vessels without being penalized renown. I check the Flag chart to see the time frame of when these nations came into the war as the "enemy".
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