Using the shipping lanes as a guideline is a plus, obviously. After a few patrols in the same area, you'll figure out which of those tend to bear the most fruit and plan your patrols accordingly.
I'm not as energetic as some of the other posters when it comes to 'area coverage'. If I figure I'm in a likely spot, I'll spend a day or three, motionless, submerged in the day, surfaced at night, waiting for a sound or radar contact.
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"Stop sounding battlestations just to hear the alarm."
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