I'm really not sure and my estimations comes from playing only 1 career:
1. I would say same as you can see them, minus a few hundred meters because of the fact that a sub has less height above the surface.
2. I adjust my speed in accordance to speed hotkey numbers times distance of 1000 meters:
1(ahead slow)x1000=1000, 2(one third)x1000=2000....5(ahead flank)x1000=5000
3. I think within a 1000 meters, but the distance increases through the years.
Maybe some of the more experienced kaleun's can add their thoughts?
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