Look for task force contact reports. Estimate their course. Intercept. If I remember right, in the early war there's a task force that comes down from Loch Ewe to Gibraltar. I passes just east of Rockall, on a SSE course towards gibraltar. A good way to catch it is to hang around at the mouth of gibraltar. There's a ton of stuff that gets squeezed through the strait. It's a good place to bag a BB.
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