Liaison between the submarine tracking rooms in London, Washington and, from May 1943 onwards, Ottawa in Canada was so close that, according to a statement by one individual involved at the time, they worked like a single organisation.
La communication entre les "U-Boot Tracking-Rooms" de Londres, de Washington, puis, à partir de 1943, de Ottawa (Canada) devint à ce point étroite que, selon les participants, elles travaillaient comme une organisation unique.