South Korean shipbuilder Hanwha Ocean Co. said Wednesday it has succeeded in developing three key devices of a submarine sonar system. They include a sonic depth finder, a sonar beacon and an ...

This technology grew out of a pair of essential earlier advancements in sonar technology. The first, was the invention of the sonic depth finder (SDF) in the early 1920s, which itself grew out of ...

The fathometer, a sonic depth finder, recently had been developed and, to our knowledge, ours was the only aircraft carrier equipped with one.

They include a sonic depth finder, a sonar beacon and an underwater environment measuring apparatus, which could help boost the operational capability and viability of a submarine, Hanwha Ocean ...