Hi there. Basically the notepad system for attaining the value for target speed is an automatic process. The idea is once you've identified, ranged and entered the AOB value, you click the little timer icon on the notepad for speed, remaining locked on target for around 30 seconds. When you stop the timer the value appears on the notepad, then click the tick icon to send data to TDC. This value isn't always 100% accurate but it's usually fairly close if you've gotten everything else correct.
Timing the target from bow to stern is an alternative method for gathering speed outside of the notepad system. Once you've timed the ship across your scope there are several ways to find the speed in knots, typically using some tool such as RAOBF or U-Jagd chronometer. Those are only available with additional mods, such as ARB Widegui for example. If you don't have those but would still like to do it that way, you could use this formula: 1.94 x ship length (meters) / time (seconds) = speed in knots. All the best!
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