INTRODUCTION TO SONAR 



REPORT EVERYTHING 

 YOU HEAR 



One of the Sonar Technician's most important 

 tasks is to distinguish the target echoes from 

 other noises that tend to mask them. Sonar 

 operators hear many kinds of echoes. Rocks, 

 shoals, buoys, mines, surface craft, whales, 

 schools of fish, wakes of surface craft and 

 submarines, as well as the submarines them- 

 selves, can reflect sound. 



Report every sound you heai', regardless 

 of whether you can identify the echo. Figure 4-31 

 illustrates a few of the many objects that may 

 return an echo or emit a sound. Do not delay 

 making your report while you try to determine 

 what you have detected. By the time you decide 

 it's a submarine, it may be too late. Don't be 

 afraid to make a report that may turn out to be 

 nonsubmarine. The safety of your ship and the 

 lives of your shipmates are worth more than 

 the time spent or the ordnance expended on a 

 false contact. 



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