You could go to the fjord just to the north of Narvik. You will find a lot of stationary English shipping there. Beware of the troop carriers; they will start moving (fast) as soon as you fire your eels.
Some nice tonnage to be had though. If you are lucky, you might even encounter an iceberg and witness a Luftwaffe attack on enemy shipping. I had a few very entertaining patrols there.
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Daddy cool 
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