[141]        COMMUNICATION INTELLIGENCE SUMMARY, 5 November 1941
 
General.-Traffic volume above normal. All circuits heard and receiving  conditions were fair to good. TOKYO very active as an originator,  sending out many messages of general address. Two WIWI messages in Kana  Code sent by NGS to Chief of Staff CarDivs and TIYA 44 (unidentified)  respectively. The Intelligence Offices of China Fleet and TOKYO continue  active with many dispatches passing between the two.
Third Fleet.-Two units of the Third Fleet appear today in TAKAO area.  Since these calls are as yet unidentified (RISI4 and YOA2) it is not  known how much of this fleet they represent. It is fairly certain that  the Commander in Chief, Third Fleet has not yet left the Sasebo area  although it is expected that he will before long. One message which may  be a movement report from him was received late on the 5th. The present  state of call recovery on the Third Fleet does not permit of an estimate  of the movement involved.
A unit of the First Fleet, identified today as CARDIV 4 appeared today  at BAKO. This Carrier Division was addressed as "less FUTA SHOTAI" (2nd  Section?) Whether or not these are other units at BAKO is not known. The  Commander CARDIVS has been associated with SAMA and BAKO in several  dispatches today. The following were also associated, SANCHOW ISLAND,  TAKAO AIRCORPS, CANTON (China) and YOKOHAMA Air. The RNO TAIHOKU  originated many dispatches to TOKYO and the French Indo China Forces. A  TAIWAN originator sent one to Lieut. Comdr. SHIBA at the Embassy  THAILAND for information to HANOI and the Commander French Indo China  Forces.
BAKO originated numerous dispatches to the Empire and to the Major Fleet  Commanders.
The South China Fleet was also the recipient of many dispatches from  TOKYO.
Despite the uncertainty due to the Change of Calls it is believed that  there is now being effected a concentration of naval forces in the BAKO  area which will comprise the Third Fleet as organized in SASEBO for the  past month and will be augmented by heavy air forces and Combined Fleet  units to an unknown extent.

 

(FROM: U.S. CONGRESS JOINT COMMITTEE ON PEARL HARBOR ATTACK HEARINGS; PT.  35, THE CLAUSEN INVESTIGATION, PP. 62-81. EXHIBIT "A" DAILY COMMUNICATION INTELLIGENCE SUMMARIES)