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Originally Posted by nomad_delta
Curious, I've also seen many references in the forums to the "3:15 rule" for speed calculation, something to do with tracking the distance a target covers in 3 minutes and 15 seconds making the speed calculation much easier, but I've never been able to track down instructions on exactly how it works anywhere -- does anyone know how to do this or have a link to where it's described?
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The 3:15 Rule states that the distance (in meters) that a ship travels in 3 minutes and 15 seconds is equal to the speed in knots * 100.
So, if a target travels 700 meters in 3 minutes and 15 seconds, it's speed is 7 knots. Likewise, if a ship travels 1800 meters in 3:15, it's speed is 18 knots.
It's more applicable to SHIII than SHIV, unless you are using metric measurements in SHIV, which seems somewhat heretical.
To adapt it to SHIV using Imperial units, you either have to convert the distance from yards to meters and then apply the rule, or simply change the time you measure by the appropriate amount.
or you could just use a slide rule.......