Oh, and whenever you leave a German port, there should be a small warship just ahead of you, outbound. That's your escort ship. Stay right behind her and do as she does, and you'll be just fine. When she turns around and heads for home, that means you're clear of the mines and sub nets. Good hunting
!
You can also use her on your way in. Just wait for her where she left you and eventually she'll come. She's in an infinite loop between the outer perimeter and the harbour.
Funny thing is, so many people see her leave without considering her significance. I didn't realize she was my guide dog until a
GW developer pointed it out to me - I thought she was just a random eye-candy warship
!