I looked up online for any shipping lane maps during WW2 in the Pacific to get an idea. You can do the same. Or when I first started I made patterns up myself to cover the greatest surface area in the least amount of time. I think the sub war was a touch and go business until the Japanese code was broken. In fact the last two patrols turned up nil. What I do is sneak into the closest enemy harbors (ones without DD patrols of course) and sink tonnage to my delight. But targets or no targets I just fancy this sim.
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"Silence means death. Stand on your feet. Inner fear your worst enemy."- Sepultura.
My Silent Hunter 5 mantra is this......"Torpedo missed, sir!" 
A P-400 is a P-40 with a Zero after it.
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