P.S. In my ramblings above I considered plotting the target motion while you are doing the end-around/overhauling/sprint-ahead at maximum range not to get detected. It's safe from a distance, and time well spent. You do not want to wait with measuring target speed at the very last moment before firing (like the notepad-method wants you to) when you are submerged.
If you must, then the fixed-wire method is a better option. But just as a check. As it also requires ID of the ship's length, and good visual on the bow and stern. It takes in the order of a minute in most cases. You better not be turning, or looking to the side with your periscope when you are moving. Or it will be wrong.
Speed is the most important value to get the torpedoes leaded onto the target. It deserves the most effort and time to get it right. And the least chance of mistakes made in a hurry.
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