well the assigned patrol area is just an assigned patrol area... you get renown for going there, and you get more renown for patrolling it for 24 hours. but you dont HAVE to go there... in fact a lot of people pick their own happy hunting grounds and head for that in nearly every mission regardless of their assignemnt.
To complete the harbor patrol just take the u-boat for a lap around the port and when you have had enough of that just stay within 25 KM of your port and hit excape and click "Dock at ____" (whatever your port is) you get credit and experience for completing a patrol because the computer sees that you left port and you came back to port... despite the fact that you didnt really do anything at all.
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