A good practice would be to stay submerged as long as possible. I normally only surface between 12 midnight and 5 O'clock only to charge my batteries. Plus you will get more contacts vie Sonar while submerged at further distances than you do using your Watch Crew. You will also see a dramatic increase in fuel mileage. Only drawback is that you need to set your speed to Ahead Slow, but you get used to it.
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