1. What is SONAR?
A remote sensing technique or device that uses sound waves to detect, locate, and sometimes identify objects in water.
The term is an acronym for sound navigation and ranging.

6. Uses of SONAR… Naval uses include detection of: submarines sea mines
torpedoes
swimmers
torpedo guidance
acoustic mines
navigation. .

7. Uses of SONAR Civilian uses include: determining water depth
finding fish
mapping the ocean floor
locating various objects in the ocean such as pipelines, wellheads, wrecks, and obstacles to navigation
measuring water current profiles and determining characteristics of ocean bottom sediments