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Udaloy FF's are picking up 688's deep under a surface duct at 20 miles. (688I speed 14kts) In unmodded DW, the Udaloy wouldn't detect a 688 at 17kts until it was within 10 miles, presumably with active sonar.
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I have the FFG picking up the 688(i) at 15 kts at 11nm.
Of course, the regular 688 is a bit louder, especially at speed.