Positions and numbers of enemy submarines in the Atlantic Theatre according to the U.S. Joint Intelligence Committee. Daily summary dated 21 April 1942

An item claimed that the enemy submarines west of the longitude of the Azores on the west Atlantic Ocean were on 20 April positioned as follows 6 close in along the North American coast between Nova Scotia and Cape Lookout, 2 close in along the east coast of Florida; 3 well off shore to southeastward of Nova Scotia; 4 well off shore to northwestward of Bermuda; 5 between latitudes of Northern Newfoundland and New York and longitudes of Newfoundland and Bermuda, 4 to eastward and northeastward of Bermuda; 4 (maximum) in Caribbean; 2 (possibly) off north coast of Brazil; total 30. The submarines to the eastward of a line between Cape Race and Bermuda appear to be on passage, about one-half eastbound and one-half westbound."

Source

Map Room Papers (Roosevelt Administration), 1942 - 1945. U.S. Joint Intelligence Committee. Daily summary No. 132 dated 21 April 1942