I personally do not like to use the WO to determine target speed. If you want to do it, you have to be at a complete stop, (that is the first part that I do not like, because it is practically impossible to not be moved by the sea in real life) and you have to enable follow target so that your periscope tracks the targets bearing. Then you enable the determine speed feature and wait. The longer you wait the more precise your measurement will be. But even when waiting more than a minute the WO will often give out a wrong speed reading.
You shouldn´t trust him.
That is the main reason why I do not use that feature. Speed can be obtained much easier and faster by using the U-jagd clock or, even better the RAOBF. I´m showing both methods in the video I posted yesterday (four posts ago)
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