Rear Admiral Alexander L. Duff, Assistant Chief of the Naval Staff, British Admiralty, to Vice Admiral Sir William Lowther Grant, Commander-in-Chief, North America and West Indies Stations
To C-in-C N.A. & WI. DATE 15-7-18
201 In view of continued attacks on Atlantic routes by enemy submarines the following principles are to be adhered to in routing East going convoys.
A. Routes are to be varied as much as possible within the
areas forbidden to West going traffic as laid down in
paragraph 24 of Approach Routes.
B. The meridian on which the routes of convoys turn to
the northward is to be constantly varied with due
observance of the actual ice situation.
C. The routes across the Atlantic from the turning point
to the initial Rendesvous are not necessarily to adhere
to the great circle, but should be varied as much as
Possibility of using BELLEISLE STRAITS from H.S.
Convoys is also to be considered and reported on. The
main principle to be borne in mind is that routes should
be varied. 1926.
Source Note: Cy, DNA, RG 45, Entry 517B. Below the close is a routing list: “Convoy (2) [Convoy Section]/D.M.M. [Director of Mercantile Movements Capt. Frederic A. Whitehead]/A.S.D. [Anti-Submarine Division]/Force Commander U.S.N. [VAdm. William S. Sims]/French Liaison Officer.” And below that are the initials “NKY,” which was presumably the transcriber. Along the top of the page is a printed number giving ordering information concerning the pad on which the telegram was typed.