If you've got the time, plot the bearing and range of the target over several points and use time X speed = distance. If you're short on time (which is most of the time engaging TFs) get as good as a solution as you can by just guessing, and a minute later check the targets actual bearing against the position keeper computed bearing. Assuming you have a decent range/AOB estimation and the ship hasn't changed course speed will be your only variable. If the computed bearing is close to observed bearing, you know you have a good solution, if the observed bearing is in front of the computed bearing you know your speed estimate is too slow and so on. The position keeper is your friend.
PD
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