yeah, for single target is asking watch officer for measuring its course and speed good if you don't have god's eye enabled (funny is, that all of the most serious guides about mathematical conclusion of speed and course was built upon the marking exact position via enabled god's eye) .. problem is, if you're targeting more ships from convoy .. your WO will still refer only the closest one ..
i play on 100% realism and it's very hard to get enemy's speed from one spot by measuring ..
to be honest i usually make all decisions off hand by some initial measuring .. distance is obvious (it starts to be precise below 3000m), AOB is tricky but still can be derived by eye and the speed should be also precise if you have good watching position (AOB 60-120, 150-210) ..
my second approach is to line up for a while with the target and get this way its course and speed .. disadvantage is that you should count with submerged speed so you'll hardly track this way even medium speed targets
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