Realistically, I don't think you will see much neutral/allied traffic in most of the operation area. Merchant would get out or seek safe harbour within 24 hours of the war and allied surface group will stay well within land based air cover range. Norwegian, Danish, German, Finnish surface unit will probably stay within the Baltic sea and coastal waters.
Now, if we get other theater of operation, I'm sure we'll see more neutral/allied traffic.
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