IXB, eh? That's my baby.
I don't run noise meters but, from your description, it sounds like Silent Running is not set and/or your speed is over 2 knots. Here are my sugestions:
Right click the CE so you are at his station.
Turn your view to the right so you can see both depth guages, and above them your RPM Guage.
Click your Lee Helm so you make the numerical entry, as opposed to "slow", osv.
Tell the CE to set Silent Running. (I guess you knew all that, so now comes the IXB trick).
Set your Turns (RPM) at exactly 90. This will give you about 1,9 or 1,95 knots.
Now you've set the real Silent Speed for the real IXBs.
At 102 meters you have about 34 seconds to evade DCs.
120 meters will give you 40 seconds, which isn't bad.
150 meters will give you 50 seconds. That may be good enough not to break Silent Running when he drops. Keep your aspect low, and keep your fingers crossed.
Good Luck on this, or more likely, future patrols.
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