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by sas224dbm 1712 days ago
I worked on Target Motion Analysis (TMA) software that was live on S&T class UK submarines in the 90s. There were only a few types of data that were highly classified and which we never saw, Electronic Surveillance Measures (ESM) databases were an example. Emitter characteristics could pretty much allow a good SONOP (Jonesy!) to be able to identify specific instances of a class of boat. Fun stuff.