If you're around the imperial home islands, look to where the major ports are. Hang about 20nms off the coast in deep water, where the shipping routes come into them.
Also, like the real boats did, make sure to submerge before sunrise, and wait until after sunset to surface so search planes don't catch you on the surface. Since you have TMO, if you have a Gato, or Balao spend your daylight hours 450 to 500ft down.
Make sure you check the hydrophones every couple hours. If you do pick up on a convoy during daylight hours, and it's always good to surface to close the distance if they are far off, but before you surface, go to radar depth, and make sure you don't have any planes in the vacinity. Then blow tanks, and go to flank speed to close the distance fast.
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A legislative act contrary to the Constitution is not law.
-John Marshall Chief Justice of the Supreme Court
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