The US Navy ordered a safety stand-down for the entire submarine force on Wednesday in response to the results of an investigation into an incident last month in the South China Sea.
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Because 99% of the time active sonar is not in use. Only passive. Any transmissions are a counter detection threat. So you only go active in very specific instances. It’s rare.
The fact that they did fire the sonar chief, for something that would usually be a navigation problem, makes me believe there is more to the story.
Yup, active sonar pings give away position.