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If the shiplength intel is good, speed is also good.
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It's difficult to explain, but intel was not always that good. The recognition manual was used in real life, that's true, but normally the dimensions of a ship were calculated rather differently.
For example: A commander observed a cargo ship through the scope. The number of cranes shows the number of cargo bays, and in turn that number of cargo bays can be multiplied by around 1500-2000 GRT to determine total gross tonnage (Including machiney and such). Once the tonnage is figured out, the length of the ship can be estimated using naval construction mathematical formulas (Ships tend to keep the same proportions no matter the size). By such means did the U-Boat crews approach the length of the ships normally.
And, as we know, like their American counterparts they tended to overestimate a lot, so it is not completely mad that the clock had a tendency to compensate that. Of course that's only a rough guess :hmm: