CONFIDENTIAL REPORT 2G-21
S68
     
 
FORMER GERMAN SUBMARINE TYPE XXI
 
 
 
 
SONAR EQUIPMENT
 
     
 
SUMMARY
  
     
          The installation of sonar equipment and types of equipment corresponds in general with the installations in type IXC vessels.  Reference should be made Report 2G-9C-S68 for detailed information, however, it is observed that the surface search radar equipment is installed in the Sound Room.  
          The main difference lies in the installation of an additional system in the Sound Room.  This system is primarily an echo ranging equipment, manually trained.  Its location is adjacent to the G.H.G. listening equipment.  In use the practice was to obtain a bearing from the GHG operator, train the echo ranging projector to the bearing given - - audible and visual presentation are designed into the equipment to determine "on target".  This equipment is designated as the SU system.  
          Only two of the above systems are available to the USN, one having been shipped to USL Fort Trumbull for bench testing and detailed exploitation and as possible spares for U-2513 in which the other system is installed.  
          Reference should be made to NavTech Report No. 530-45 dated 31 October 1945 and to USL reports when they become available for detail information.  No instruction books have been available to the shipyard on this system.  
     
     
     
 
July, 1946
 
 
 
 
PORTSMOUTH NAVAL SHIPYARD, PORTSMOUTH, N. H.
 
     
     
     
 
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