I have not had any problems using that method, if the result comes out for example at 6.74 are your rounding to the nearest whole knot?
Also doing it on the move in the method described above dosnt completely eliminate the movement of your own ship from the equation, it only minimises it. When you are relatively close to the target 1-1.5km it makes minimal difference, however a minor error in speed calculation is amplified over distance wich may result in a miss.
Pisces may i ask what method you use to calculate speed, especially on the move?
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