There ARE sonars that deliver an image. http://blueprintsubsea.com/starfish/images/sonar/452/sf452_steamship.jpg http://blueprintsubsea.com/starfish/images/son

There ARE sonars that deliver an image. http://blueprintsubsea.com/starfish/images/sonar/452/sf452_steamship.jpg http://blueprintsubsea.com/starfish/images/sonar/452/sf452_s... That's just one example - look for side scan sonars for the earliest stuff (https://en.wikipedia.org/wiki/Side-scan_sonar https://en.wikipedia.org/wiki/Side-scan_sonar) or sonar imaging for the latest stuff (http://www.tritech.co.uk/product/gemini-720i-300m-multibeam-imaging-sonar http://www.tritech.co.uk/product/gemini-720i-300m-multibeam-...)