Stock game issue most likely. For some reason, they decided that a ship traveling less than half of its maximum rated speed would be invisibly silent to the player... I don't know if that's to encourage them to use their assigned sonar "man", or what... so if you've got a DD rated at 37 knots top speed, and it does anything less than 18.5 knots, it becomes "invisible" to your ears. Of course, the average convoy travels at about 9 knots, so... If a vessel has a rated top speed of 15 knots, and they're doing 9 knots, you can hear them. They slow down to 7 knots while turning though, and they'll "disappear" to you... CapnScurvy has been experimenting endlessly with this, and hasn't found an acceptable way around the issue, other than speeding everybody up...
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"...and bollocks to the naysayers" - Jimbuna
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