Maritime Wireless Communication Schedule




MAY 23.] THE NEW ZEALAND GAZETTE. 1177

Of these, Messages 0241/7, 2358/6, 0912/7, and 0436/7 are new traffic; remaining messages have previously been transmitted at one or more routines.

Routine will be carried out as follows:—

GBMS GBMS GBMS de GBR—QTC—GBMS—0241/7—1720/6—0645/6—GBMS 1—2358/6—1131/6—GBMS 1 and GBMS 6—1827/6—GBMS 3B—0912/7—1127/5—GBMS 10—0436/7—0916/6.

Traffic will then be broadcast in the following sequence:—

Call Sign. Message. No. of Transmissions.
GBMS 0241/7 Two.
GBMS 1720/6 One.
GBMS 0645/6 One.
GBMS 1 2358/6 Two.
GBMS 1 1131/6 One.
GBMS 1—GBMS 6 1827/6 One.
GBMS 3B 0912/7 Two.
GBMS 3B 1127/5 One.
GBMS 10 0436/7 Two.
GBMS 10 0916/6 One.

(v) In the case of GBMS traffic broadcast from 500 kc/s stations during single operator periods, the messages for transmission will not be indicated at the beginning of the broadcast (except as shown in paragraph 5 (iv) for Areas 1 and 2), but new traffic will always be broadcast first, each message being sent twice; repetitions of previous transmissions will follow, each message being sent once only.

(vi) In Area 1 500 kc/s stations will normally broadcast GBMS traffic approximately one hour after the times shown for traffic list in the Admiralty List of Wireless Signals, Vol. I, and in Area 2, one hour after the commencement of single operator periods, since certain routine broadcasts on other frequencies occur at the beginning of these periods.

(vii) Similarly, in other areas, the times of broadcasting GBMS traffic from 500 kc/s stations during single operator periods will be so adjusted as not to coincide with routine broadcasts of GBMS traffic from other stations in these areas. Where interference between local stations is likely to occur, the times will as far as possible be staggered.

  1. The messages from the Admiralty to all areas will be issued in alphabetical sequence thus: “Admiralty Message A,” “Admiralty Message B,” &c. After lettered message Z the sequence will be AA, AB, &c., to AZ, thereafter BA, BB to BZ, and so on. Messages to all areas not made by W/T but passed to Merchant Ships via Shore Authorities will also belong to this series and be similarly lettered. For example, messages BA and BC might be made by W/T and message BB passed only via Shore Authorities. This is to enable merchant ships to check that they have not missed any messages in the series.

Any messages which have been missed should on no account be asked for by W/T. They should be obtained by V/S from H.M. Ships or other British merchant vessels or by personal application to the British Naval Representative or Consular authorities at the next port of call.


SCHEDULE.

NOTE.—The transmission from Rugby on 16 kc/s (18,750 metres) at 2000 G.M.T. is intended primarily for ships in Area 5, and that on 8,730 kc/s (34·36 metres) at 2000 G.M.T. for ships in Areas 3, 4, 5, and 6.

Area (see Chart). Naval Authority who will arrange Transmission. W/T Stations by which Messages will be transmitted. Call Sign. Wave. Kc/s (metres). Type A1 except on 500 kc/s (600 metres) or where otherwise stated. Times of Transmission. G.M.T.
All areas Admiralty .. .. Rugby .. GBR 16 kc/s (18,750) }
GCI 8,730 kc/s (34·36) 0060.
Oxford .. GIM 12,975 kc/s (23·12) }
GIJ* 6,985 kc/s (42·95)
Rugby .. GBR 16 kc/s (18,750) }
GIM 12,975 kc/s (23·12) 1200.
Oxford .. GAI2 18,720 kc/s (16·03) }
GIA† 19,640 kc/s (15·27)
Rugby .. GBR 16 kc/s (18,750) }
GCI 8,730 kc/s (34·36) 2000.
Oxford .. GIM 12,975 kc/s (23·12) }
GIA† 19,640 kc/s (15·27)
Falklands .. VPC 8,450 kc/s (35·5) 0410, 1610.
  • During the months of November, December, and January only. † Directional Array for ships in South American waters.


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🚂 Notice to Mariners No. 13 of 1940 regarding British Official Wireless Messages to Merchant Ships (continued from previous page)

🚂 Transport & Communications
20 May 1940
Maritime, Wireless Messages, Merchant Ships, Safety, Communication Schedule