Basically, if you get a patrol zone, and you stay in it, for the hours required, you get a bonus promotion point you can assign to your crew right away. If not you lose it. If you are stalking a convoy, forget the bonus point, you will get more points in tonnage sunk. Go for it! Just be sure to return to the zone, finish your hours, so you can get a new zone for more bonus points.
As far as hydrophone checks, I don't use automatic scripts often. I check every 2 hours on a clear day, and more on terrible weather/foggy days.
If I am in 60m... heavy fog... heavy rain, I stay submerged and check the hydrophone manually as much as possible.
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