McCormick's new command extended from the North Pole to the Tropic of Cancer and from the shores of North America to those of Europe and Africa, with the exception of the English Channel and British coastal waters.

The command's area of responsibility extended from the North Pole to the Tropic of Cancer as well as extending from the east coast of the North America to the west coast of Africa and Europe, including Portugal but not the English Channel, the British Isles, and the Canary Islands.

The meridian 169 west of Greenwich is a line of longitude that extends from the North Pole across the Arctic Ocean, the Pacific Ocean, the Southern Ocean, and Antarctica to the South Pole.