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ETR3(SS) · 12-04-09, 09:37 AM

If it's not making noise, you cant hear it on passive. You might pick up the flow noise of the water around the hull but it might just sound like normal surface action. Active sonar can find anything on the other hand as it sends out a sound pulse and you wait for the sound to be reflected off the contact. You can't classify a contact that way but at least you know something's there.

12-04-09, 09:37 AM	#2
ETR3(SS) Ocean Warrior Join Date: Dec 2007 Location: Between test depth and periscope depth Posts: 3,021 Downloads: 175 Uploads: 16	If it's not making noise, you cant hear it on passive. You might pick up the flow noise of the water around the hull but it might just sound like normal surface action. Active sonar can find anything on the other hand as it sends out a sound pulse and you wait for the sound to be reflected off the contact. You can't classify a contact that way but at least you know something's there. __________________ USS Kentucky SSBN 737 (G) Comms Div 2003-2006 Qualified 19 November 03 Yes I was really on a submarine.