It's interesting to me that O'Kane followed a method (actually it was Moreton starting it on Wahoo) that, in essence, turns the USA TDC into a German fire control method i.e. disable the PK and 'tell' the TDC where the target is such that the torps will go where the scope is pointed. Clearly O'Kane felt this was the best way to go, and his hit rate and rate of sinkings (1 ship per 11.5 days of patrol - twice as good as the next ranked boat in this measure) indicate he was probably correct.
It's true the USA's TDC was the most advanced, but interesting that this doesn't necessarily translate to superior performance in the field. O'Kane seems to have used its advanced capabilities to develop firing data (PK and angle-solver capacity very good for that), but then 'disabled' it when it came to the actual firing. Intriguing!
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