If you want to get a last final speed calculation Using the U-Jagd is probably the best option. Plotting speed over time is good for longer range
You can do it on the fly you just need to time the ship passing from aft to stern thru the scope its useful if the target changes speed at the very last moment you just need an approximation of the ships length . It is surprisingly accurate. I use it most of the time combined with time over distance for long range . Also using the scale which is displayed on the right of the map Knots/Km/Minutes is useful that method just needs a line drawing across the scale from dist thru time the intersection in the middle gives the speed saves working it out in your head
There are few more ways it depends on the scenario and what suits you best some of the more complicated methods don't necessarily give a more accurate calculation. Same applies for AOB and course etc
This is a decent video on the U-Jagd you need TDW's UI or any mod with U-Jagd included. It switches over from the normal stopwatch by right clicking on it
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