In GWX2 (I gather you use it from your sig) you have a nomograph in your mapscreen, on the right hand side. I use my own stopwatch on my wristwatch. Zoom maximum in on target and put a marker on it, start stopwatch, let it go for 1 minute, then put marker on new position. Measure the range between the marks. The longer time you use, the more accurate your reading, but I find it accurate enough in 1 minute.
Now use the ruler with the nomograph. Put beginning of rule on 1 minute and draw a line from there to the distance you measured between the 2 markers. Extending the line, you will find the corresponding speed in knots.
Also, find the most excellent OLC GUI mod in the SH3 Mods forum. It gives you much better manual targetting tools used in real life than what's stock in SH3. I couldn't do without it anymore. With this tool, it is fairly easy and accurate to measure speed, range and AOB from the attackperiscope.
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