ice reconnaissance flights were made, ice conditions were forecast for 

 tlie fortlicoming 12-liour period. This analyzed or forecast informa- 

 tion was used to prepare the ice advisory broadcasts and bulletins, 

 the primary means of disseminating ice information to shipping. 



From 1 March to 6 June ice information was broadcast daily to 

 shipping by U.S. Coast Guard Radio Argentia (NIK) at 0048 and 1248 

 G.m.t. simultaneously on 155, 5320, 8502 and 12880.5 kcs. Each broad- 

 cast was preceded by a general call on 500 kcs. with instructions to shift 

 to the above operating frequencies. A 2 minute period of test signals 

 transmitted on the operating frequencies facilitated receiver tuning. 

 Each broadcast was transmitted twice, once at 15 words per minute 

 and once at 25 words per minute. Prescribed radio silent periods were 

 observed. Ice bulletins were also sent via teletype to the U.S. Naval 

 Oceanographic Office, Washington, D.C. for further dissemination 

 twice daily by U.S. Naval Eadio Washington (NSS) on the regvdar 

 "Hydro" broadcasts, for inclusion of a daily ice chartlet in the daily 

 memorandums and for a weekly ice chartlet. Ice bulletins were also 

 sent via teletype to the Canadian Department of Transport, E.C.N. 

 Radio Station, Albro Lake, N.S., and others for further dissemination. 



Ice conditions were also transmitted by facsimile at 1330 G.m.t. daily 

 on 5320, 8502 and 12880.5 kcs. Facsimile ice information is more 

 reliable and complete than radio broadcasting as it is not subject to 

 human reception errors and as considerably more information can be 

 incorporated in the facsimile format. 



Frequently, regular ice broadcasts concluded with the request that 

 all shipping in the ice patrol area report to NIK all ice sighted, 

 weather conditions, and sea temperatures every 4 hours. The effective- 

 ness and efficiency of the International Ice Patrol was enhanced con- 

 siderably by the excellent response by .shipping to this request. 



Duplex radio operations were used between NIK and merchant 

 ships for general radio communications. Merchant ships worked NIK 

 on 500 kcs., and 8 and 12 Mcs. martime calling band. NIK worked 

 427, 8734 or 12718.5 kcs. as appropriate. 



During the 1965 season. Ice Patrol communications involved the 

 handling of 17,668 radio messages and 18,321 landline messages of 

 which 205 were ice broadcasts and 205 teletype bulletins. Statistics 

 concerning the reports received from shipping during the ice season 

 are as follows : 



Number of ice reports received from vessels 227 



Number of vessels furnishing ice reports 172 



Ximiber of sea surface temi>eratures reported 6. 347 



Number of vessels furnisbing sea temperatures 876 



Number of vessels requesting special information 102 



Number of weather reports relayed to U.S. Weather Bureau 



(METEO, Washington) 554 



