COMMUNICATIONS 



Ice Patrol communications included ice, meteorological, and 

 oceanographic data, Ice Bulletins, special ice advice, a daily 

 facsimile chart, and the administrative and operational traffic 

 necessary to the operation of the Patrol. The Ice Bulletin was 

 transmitted by teletype from the Ice Patrol Office in New York 

 twice each day to over 30 addressees, including those radio 

 stations which broadcast the Bulletin. These radio stations were 

 the U. S. Coast Guard Radio Station Boston/NIK/NMF, U. S. Naval 

 Radio Station Washington/NSS, Canadian Coastal Radio Station 

 St. John's/VON, and Canadian Forces Maritime Radio Station Mill 

 Cove/CFH. 



Coast Guard Radio Station Boston transmitted the Bulletin by 

 CW at 0018 GMT on 5320 and 6502 kHz and at 1218 GMT on 8502 and 

 12750 kHz. Coastal Radio St. John's made CW broadcasts at 0000 

 and 1330 GMT on 478 kHz, while the stations at Mill Cove and 

 Washington made their CW broadcasts on a wide range of low and 

 high frequencies. An abbreviated form of the normal Bulletin was 

 included in the twice daily voice transmission of the North 

 Atlantic High Seas Broadcast which originated from Radio Boston. 

 A daily radio facsimile broadcast, a service which was not 

 available in 1970, was reinstituted on 10 March. A chart 

 depicting the locations of icebergs and sea ice was broadcast 

 at 1600 GMT simultaneously on 8502 and 12750 kHz at a drum speed 

 of 120 revolutions per minute. 



In a conscious effort to shorten the Bulletin's transmission 

 time, the sentence, which requested ships between latitudes AO^N 

 and 50°N and between longitudes 42 °W and 60°W to report their 

 position, course, speed, visibility, air temperature, sea surface 

 temperature, and wind every six hours, was eliminated from the 

 twice-daily Bulletin. Perhaps as a result, the number of these 

 reports received from shipping fell to 159 from the total of 1014 

 received in 1970. During the Season 162 ice reports were received 

 from shipping. There were 4 requests for special ice information. 



