Nope. It is both a "sensing" and a range estimating apparatus. You can reveal a "silent running" sub with active sonar while you may have missed it on passive sonar.
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- Oh God! They're all over the place! CRASH DIVE!!!
- Ehm... we can't honey. We're in the car right now.
- What?... er right... Doesn't matter! We'll give it a try anyway!
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