COMMUNICATIONS 



Ice Patrol communications included receiving 

 reports of ice, sea surface temperature, and other 

 environmental conditions, transmitting twice- 

 daily Ice Bulletins and a daily facsimile chart, 

 and the administrative and operational traffic 

 necessary to the proper conduct of the Patrol. 

 The Ice Bulletin was transmitted by teletype 

 from the Ice Patrol office in New York twice 

 each day to our 30 addresses, including those 

 radio stations which broadcast the Bulletin. 

 These stations were U.S. Coast Guard Communi- 

 cations Station Boston/NMF/NIK, Canadian 

 Coast. Guard Radio Station St. John's/VON. 

 Canadian Forces Maritime Command Radio Sta- 

 tion Mill Cove/CFH, and on the U.S. Navy 

 LCMP Broadcasts from Norfolk, Virginia; 

 Londonderry, Northern Ireland; Thurso, Scot- 

 land: and Keflavik, Iceland. The daily radio- 

 facsimile ice chart was broadcast from the Ice 

 Patrol offices in New York via a transmission 

 line direct to transmitters at U.S. Coast Guard 

 Communications Station Boston/NIK. 



Coast Guard Communications Station Boston 

 transmitted the Bulletin by CW (Morse Code). 

 A 2-minute series of test signals, the transmissions 

 were made at 25 words per minute and then re- 

 peated at 15 words per minute. Table 2 lists 

 frequencies and times of broadcasts used at the 

 various radio stations for the Ice Patrol Bulletin : 



Special broadcasts were made by Canadian 

 Coast Guard Radio Station St. John's/VON and 

 U.S. Coast Guard Communications Station 

 Boston/NIK as required when icebergs were 

 sighted outside the limits of ice between regularly 

 scheduled broadcasts. These transmissions were 

 preceded by the international safety signal 

 (TTT) on 500 kHz. 



Merchant ships calling to report ice sightings, 

 weather and sea surface temperature to the Ice 

 Patrol were requested to contact U.S. Coast 

 Guard Communication Stations, Ocean Weather 

 Station C7H and, if unable to work these stations, 

 Canadian Coast Guard Radio Station St. John's/ 

 VON. These ships were requested to use the 



speed 120) (Primarily sea ice in 



Gulf of St Lawrence and North 



Limita of icebergs sometimes 

 given.) 



4782. 9203. 14436. or 18261 (drum 

 speed lain N Atlantic IceObs ) 



3695 8 10905 1014 GMT) and 

 13627 1 (2108-2157 GMTI (drum 

 9peed 1201 (Ice Conditions in 

 West Atlantic ) 



Preceded by International 

 Safety Signal (TTT) on 600 kHz 



regularly assigned international call sign of the 

 station being called; however, Coast Guard sta- 

 tions were alerted to answer NIK or NIDK calls 

 if used. 



Ice information services for the Gulf of St. 

 Lawrence, as well as the approaches and coastal 

 waters of Newfoundland and Labrador, were 

 provided by the Canadian Ministry of Transport 

 from December until approximately late June. 

 Ships obtained ice information by contacting Ice 



