Another thing that can light up your green sound indicator lamp is a Junk or a Fishing Boat if they're close enough. I've had it happen and discovered the culprits with my periscope.
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Originally Posted by commandosolo2009
Speaking of which, if I ping after a destroyers ASDIC, would it register as detection? If you've seen the movie , "Below" 2002 
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Not exactly sure what you're asking here commando, since a destroyer's ASDIC
is it's active sonar. They can tell the difference between their own return and a ping from a different vessel, if that's what you mean.