FOREWORD 



An understanding of sound velocity structure Is necessary for effective 

 antisubmarine warfare in any oceanic area. This report summarizes the 

 vertical and horizontal sound velocity structure for the North Indian Ocean, 

 including representative sound velocity profiles. In addition, the total 

 sound velocity structure is related to more commonly understood physical 

 oceanographic variables. Comments on the usefulness of this report are 

 welcomed. 



"KRABEK 



•.V. 



Captain, U.S. Navy 

 Commander 

 U.S. Naval Oceanographic Office 



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