[Pisces]

First, no need to appologize for your english. It's not my native language either but it looks pretty good to me.

Simple Speed measurements can be done in a fast way and a slow way, aside from the way using the notepad thingy. (and there are even more that are a quite advanced)

Fast way:

1. Turn course to aim your bow (or stern/rear end) at the target.
2. Set the scope reticle line just infront of the target.

Preferably you move slowly (or dead stop) to prevent closing to fast, and also to improve the accuracy of this measurement. But you don't really need to if your bow is pointing directly at the target, and the target is far away. If your bow is not pointing close at the target while moving you are distorting the speed value.

3. Let the moving target approach the vertical scope line by itself.
4. Start the stopwatch when the tip of the bow crosses the line.

5. Wait until the stern (end) of the target also crosses the line, then stop the stopwatch.

6. Look up the length of the ship in the recognition manual (You need to have a good identification)

7. Divide the length by the time to get speed. Since length is in meters and time in seconds the result is in meter/sec, NOT knots. But to get knots you simply double it. It's not precise but very close (only 3% higher than true speed in knots).

Highly recommended: If you do not want to do the calculation yourself in your head, or want to use a calculator, get and learn how to use the OLC Gui or Ujagd-mod to do this. Or use the nomograph found on the map. Those three work on the same mathematical principles (logarithmic scales).

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Slow way:

Allready explained by Vedrand. Plot the position of the target on the map based on your uboot position and range and bearings taken at regular intervals. In 3 minutes 15 seconds you do get the knot value as the length of the line (between those target positions), but the number is displaced by one decimal and not very accurate. (i.e. 7 knots is shown as 0.7 km) I only use it to get a quick idea on the speed and general course the target is on. And then turn to a parallel/overtaking course. I prefer to measure with an interval of 31.5 minutes using a real-life stopwatch (patience is a virtue in this game anyway, and naval warfare is slooowwww!!!) so you get an accurate value for average speed (and course) needed for the attack. And because now the length of the line in km is the same as the amount of knots (time interval is 10 times longer) it is fool-proof and giving you enough time to take it easy. The course is very accurate too. The only drawback is the target can make a course change in that time (because of reaching a waypoint), causing you to have to start over again. But that isn't very likely in my experience.

Don't know for sure about the scripted missions. I think some where both available as standalone as wel as scripted in the campaign. I'm sure the right answer is in the GWX2 manual.