eastern half of the BFgrid? isn't that the coast of France?
Always a lot of action in the canal an around Scapa Flow (lots of destroyers, if you're interested in having a bit of horror....

)
my tactic if you dont find anything: get into a harbor. always something to torp there...
Does anyone know some good spots of the coast of America? I'm in a 9C and i get a lot of missions there, but last time I've been there, I had a storm that lasted for about a week. Didn't sink anything except for a cargo and a tanker in NYharbor....