[Shadriss]

Originally Posted by dreamofpsy

Hang on, though, how does side-scan sonar work, if the sound is only being reflected off the air/water interface? It seems able to detect wrecks easily enough... Eg. http://www.dailymail.co.uk/news/arti...ean-floor.html

So clearly, SOME sonar can detect wrecks, but why can some sonar detect wrecks but not others?

Side-Scan is a HF active with a relatively short range... IE, it's a specialized application. Your standard longer-range MF active works as described earlier.