For 1 :I tend to stay atleast 5 nm from any ship, day or night. Better safe than sorry with battleships :P
For 3 : Yes they do.
For 4:
It really depends on the range. for example at close range you can be off by 4-5 knots (close being around 500-600 yards)
If your firing at the max range of your torpedo, you will need some pretty damn accurate calculations. Have fun with that. D:
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