Appendix M
Sailing Intervals of North Atlantic Trade Convoys from North America

(Number of days scheduled between sailing, prevailing for the month)

  HX/ON SC/ONS
Halifax-
Liverpool		 New York-Liverpool Sydney-
Liverpool		 New York-
Liverpool		 Halifax-
Liverpool
N. of Ire. N. of Ire. S. of Ire. N. of Ire. N. of Ire. N. of Ire.
1941 Dec 6 -- -- 6 -- --
1942 Jan 6 -- -- 6 -- --
Feb 6 -- -- 6 -- --
Mar 6 -- -- 6 -- --
Apr 6 & 7* -- -- 6 & 7* -- --
May 7 -- -- 7 -- --
Jun 7 -- -- 7 -- --
Jul 7 -- -- 7 -- --
Aug 7 -- -- -- -- 7a
Sep 7 -- -- -- -- 7
Oct -- 7 & 8* b -- -- 7 & 8* c --
Nov -- 8 -- -- 8 --
Dec -- 8 -- -- 8 --
1943 Jan -- 8 & 10* -- -- 8 & 10* --
Feb -- 10 -- -- 10 --
Mar -- 10 -- -- 10 --
Apr -- 5d -- -- -- 8e
May -- 6 -- -- -- 8
Jun -- 7 & 8* -- -- -- 11
Jul -- 7 & 8* -- -- -- 11
Aug -- 6 & 7* -- -- -- 13
Sep -- 6 & 7* -- -- -- 13
Oct -- 6 & 7* -- -- -- 13
Nov -- 6 & 7* -- -- -- 13
Dec -- 7 & 8* -- -- -- 15
1944 Jan -- 7 & 8* -- -- -- 15
Feb -- 7 & 8* -- -- -- 15
Mar -- 7 & 8* -- -- -- 15f
Apr -- 7 & 8* -- -- -- --
May -- 7.5 avg.g -- -- -- --
Jun -- 7.5 avg.g -- -- -- --
Jul -- 7.5 avg.g -- -- -- --
Aug -- 7.5 avg.g -- -- -- --
Sep -- 7.5 avg.g -- -- -- --
Oct -- -- 5g -- -- 15j
Nov -- -- 5 -- -- 15
Dec -- -- 5 -- -- 15
1945 Jan -- -- 5 -- -- 15
Feb -- -- 5 -- -- 15
Mar -- -- 5 -- -- 10k
* Alternately.  

(a) Commencing with SC 95 sailing 4 August from Halifax.
(b) Commencing with HX 208 sailing 17 September.
(c) Commencing with SC 102 sailing 19 September from New York.
(d) Commencing with HX 232 sailing 1 April.
(e) Commencing with SC 125 sailing 31 March.
(f) Ending with SC 157 sailing 13 April.
(g) Commencing with HXF 287 (10 knots) sailing 12 April, HXM 288 (9 knots) sailing 18 April and HXS 289 (8 knots) sailing 26 April. Interval of 22 and 23 days alternately for each of F, M, and S convoys, making six convoys every 45 days, an average interval of 7.5 days.
(h) Commencing with HX 312 sailing 5 October (HXF 308 first HX to be routed south of Ireland).
(j) Commencing with SC 158 sailing 3 October.
(k) Commencing with SC 167 sailing 15 February.

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