North Atlantic dangerous area for merchant shipping according to the U.S. Joint Intelligence Committee. Daily summary dated 25 January 1942

An item reported that the North Atlantic between Iceland south towards the latitude of New Ireland going to the eastward was a dangerous area for Allied and neutral shipping due to the activities of the German submarines.

Source

Map Room Papers (Roosevelt Administration), 1942 - 1945. U.S. Joint Intelligence Committee. Daily summary No. 46 dated 25 January 1942