Sonar technicians are able to look at the sound waves and identify their source with extreme accuracy. Constantly watching the screen for a "contact," a sound pattern other than background noise ...

The sonar room is dominated by sonar consoles. Two modes of sonar observation are used. In the "active" mode, the echoes of sound waves sent out from the sub are timed and analyzed. In the passive ...

Once they get close to shore, he said, diesel-electric subs blend in with all sorts of background noise ... ship's combat information centre and the sonar room. "We are engaging more, based ...

The ratio is a measure of how much signal is discernible against a background of other ocean ... Pfeifer, went to the sonar room to observe. At some point, one or more of those in the control ...

Sonar 2087 equips eight RN Type 23 frigates. Pictured here is the sonar room of HMS Westminster – the sonar director is nearest to the camera, with the four dual-screen sonar operator consoles ...