formula
Razark's description of the 3 minutes rule is the easiest for computing speed.
Aternatively, divide the distance (in yards) by number of seconds and get the distance per second. Mulitply by 180 (i.e. 3 minutes expressed in seconds) to determine speed. The alternative is useful when you have not measured distance in terms of full minutes. Keep a calulator handy to save time calculating.
General rule: The longer the time used to meausre distnace, the more accurate the speed calculation. Note: firing at long range requires a speed be calcualted accurately to ensure the torpedoes hit the target, even under O'Kane.
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