Generally, your orders will tell you to patrol 'within' a certain mileage, i.e., 100 nm, 50 nm, 80 nm, etc. Orders will usually also state a time period--48 hrs, 72 hrs, etc. Read your orders carefully, you must satisfy both criteria (if both are specified) to 'complete' the patrol. It has been a while since I played the stock game so I'm not sure how that reads anymore, but with RSRDC your orders may say to sink ships in your circle but does not specify a time period. In that case you must sink 2 or more ships to complete that order.
As far as using the key that causes your navigator to plot a zigzag course within the circle--use that nor not. You can just place a bunch of waypoints within the circle yourself if you'd rather. The waypoints have nothig to do with completing the patrol--they are just a way to steam around within the circle.
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