National Geographic : 1950 Jan
Troubles Are Deliberately Created in Navy's Sonar Laboratory for StudentstoDetect and Repair Fleet Sonar School teaches sailors to locate and track down distant ships by means of Sound, Navigation, and Ranging (Sonar). These enlisted men, having shown special aptitude, were sent to Key West from ships and naval districts all over the map. Later they willbetrained inSonar work at sea. © National Geographic Society 55 Kodachrome by J.Baylor Roberts ----.- 411 A .