Hey FT2! Well when I was contact coordinator, I loved the simple rule of:
1-Speed X 100 = Distance travelled in 3 min.
2-Distance Travelled in 3 min / 100 = speed.
They were the simplest rules I used, even used them in SH1 & 3. Hope this helps. I know that the attack plot/chart needs a few tools in order to make plotting an attack more realistic.
Frank