I did not realize that warship routing and transit was also routinely coming from electronic eavesdropping, except for the IJN subs regularly reporting their locations; I had heard that before. Thanks for correcting my error, Spence. I'll have to check out the TROMS. Any specific examples you can think of?
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Besides the Shinano, CV Unryu was ambushed based on SIGINT detailing route, time and escort. USS England earned its ASW "world's record" based on SIGINT which specified where the IJN subs were supposed to take up station on a scouting line. Submarines I-4, I-28, I-34 and I-73 were all sunk by subs based on SIGINT. The USS Tautog, which was positioned in hopes of attacking Shokaku due to SIGINT and sank I-28, sighted several other IJN subs retiring from the Coral Sea battle and attacked another one but missed.





