Safe at halve of a (nautical)mile, about 1 km, away? Nah, I don't think so. 10 times that .... maybe. Going at flank speed?... forget stealth anyway. Go slow, deep and be patient. Even if they are circling above you, it doesn't mean they have you pinpointed. They might just be doing their search dance for a while, or forever if they are tenacious veterans. If you move far away from the general location and they keep stuck on you then you can assume that they keep getting fixes on you.
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