COMMUNICATIONS 



Ice Patrol communications included receiving reports of ice and 

 environmental conditions, and transmitting ice bulletins, voice 

 broadcasts, facsimile charts, and administrative traffic necessary to 

 operate the patrol. The Ice Bulletins were disseminated by teletype 

 from the Ice Patrol office in New York to over 30 addresses. 



International Ice Patrol Ice Bulletins were broadcast twice daily 

 by Coast Guard Radio Station Boston/NMF/NIK at 0018 GMT on 5320 and 

 8502 KHz, and at 1218 GMT on 8502 and 12750 KHz. After a 2-minute 

 series of test signals the transmissions were made at 25 words per 

 minute and then repeated at 15 words per minute. An abbreviated version 

 of the Ice Bulletin was included in the Western North Atlantic High Seas 

 Broadcast from Radio Boston/NMF on 8765. A (8764.0) KHz upper sid€? band 

 mode at 0130, 0730, 1330 and 1930 GMT and on 8764.0 KHz double side 

 band mode at 0200, 0800, 1400 and 2000 GMT. Coast Guard Radio Station 

 Boston/NIK also transmitted a daily radiofacsimile broadcast on 8502 

 and 12750 KHz (drum speed 120) at 1600 GMT. 



Ice Bulletins were also broadcast twice daily by U.S. Naval Radio 

 Station Washington/NSS at 0430 and 1700 GMT on 88.0 (0430 only), 185.0, 

 5870, 8090, 12135 and 16180 KHz; Canadian Maritime Command Radio 

 Station Mill Cove/CFH at 0130 and 1330 GMT on 4356.5, 6449.5, 12984, 

 7218.4 and 22587 KHz; and Canadian Coastal Radio Station St. John's/ 

 VON at 0000 and 1330 GMT on 478 KHz. 



Special broadcasts were made by Canadian Coastal Radio Station 

 St. John's/VON 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. 



