Nope, it doesn't work. the game used too few samples and does vary the speed for slow, medium and high speed but not continuously between speeds.
Actually in WWII there were very few targets where speed could be deduced from beat count anyway. They didn't have anything like the modern computer databases that can take a hydrophone input and tell you the name of the ship and how fast it's moving. Most of the Japanese merchant fleet was completely unknown to the Americans. And those that were known were in generally fouled and messy below the waterline, so would run different speeds than they should were they clean and in optimal condition.
For most targets, "speeding up," "slowing down," "running fast," "moving slow," etc, was about as good as you got. We did have some data on a few of the warships.
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