20 JULY 1943 HUSH SECRET GP EH8
   
6591/20/324/22 58 JDAK  BUZD SERIES 3, 0
 
     
 
FROM: BROSIN ( (134) )
 
 
     
 
19 JULY NAV SQ DM 5216 ( (23.50 N - 80.50 W) ) 5 BOMBS AND CANNON FIRE FROM NAVAL FLYING BOAT [Penned note:  Blimp] AT NIGHT.
DIVING TANK FIVE QUICK DIVING TANNK STARBOARD, AND FOURTH STARBOARD DAMAGED.  FLYING BOAT [Penned note:  Blimp] SHOT DOWN.
MANY MISFIRES ON 20 MM GUN.
 
 
 
 
 
 
     
 
DF 24.35 N - 78.45 W  L-13            CASE 20/6/08    X
  TOI 0409 Z 5412 KCS  
  TOI 1257 Z 14840 KCS 1545/28
       
 
     

 

Key and notes to translated message form

With great appreciation to cryptology historian/researcher Ralph Erskine

 

    
  Date of message US Navy Security Classification (unknown)
 
German date/time of transmission/serial # (Serial # was allocated when signal was being sent by shore station.  A different serial # was given for each radio circuit (eg. Series 1 or 4, etc)) Group count (number of four letter cipher groups in original German signal) Cipher indicator group showing which cipher was being used ( eg. Triton (Shark) or Bertok) and the group for obtaining message setting (starting position of rotor for that message) Allied name assigned to U-boat radio circuit   Series’ 1, 2 3, etc. were allied designations for various U-boat radio circuits. The circuits included the Ubootsküstenschaltung (for the Bay of Biscay and the northern approaches to the North Atlantic ), Irland (for U-boats in the north and middle Atlantic ), Amerika (for those in the north western Atlantic, central Atlantic and South American coast), Afrika (for the Indian Ocean ), and Diana and Hubertus.  From time to time they were expanded and renamed (eg. Amerika I and II ).
     
From:  
 
To:  
     
Message text
 
Text within ((        )) are US Navy translator's notes
 
Offizier ( ) was a form of doubly-enciphered Enigma. Additional plugboard settings were used, which were generally valid for 10 days in a given month.
 
Disguised Naval grid square reference, disguised using ‘Adressbuch’ (later captured from U 505)
 
     
  US Time of intercept (GMT) Frequency US time and date of decrypt at Op-20-G
     

 


 

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