Talk:Item/@comment-76.169.101.57-20120227154157/@comment-76.169.101.57-20120302092401

The most easiest way: IMAGINE SONAR (also known as ECHO-LOT or HYDRO-LOCATOR) pictures!

HERE SOME RANDOM FROM INTERNET:

design-allnn.ru/uploads/posts/2010-06/8e3xd5w6go.jpg

http://i.istockimg.com/file_thumbview_approve/3279857/2/stock-illustration-3279857-radar-sonar-detect-locate-scan-monitor.jpg