Fog and storms are the best time to attack, you don't have to see ships or get close. Just use radar or sonar and get a bearing, get within about 1000 yards and shoot down the bearing. You can use the tab to ask sonar to report closest contact and just shoot down that bearing. Once you hit the ship a few times it usually catches on fire giving you easy aiming points.
When the enemy gets radar you have to be careful, they'll chase you, but proper timing, running decks awash, using merchants to block you can run them in circles sinking away.
If you have a DG and a 40, you can take out 15 ship convoys without a problem.
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