the Air Detachment after the termination date of International Ice 

 Patrol to 23 July for the main purpose of detecting the movement 

 of any stray berg onto the Grand Banks after the conclusion of the 

 ice season. 



Table 2. Aerial Ice Reconnaissance Statistics — 1963 Season 



1 Days on which an estimated 50 percent of flight area can be searched visually with 25-mile track spacing. 



COMMUNICATIONS 



Twice-daily ice broadcasts were made to shipping by International 

 Ice Patrol radio station (NIK) , Argentia, Newfoundland, at 0048 and 

 1248 Greenwich mean time simultaneously on 155, 5320, and 8502 kcs., 

 commencing 7 March and terminating 21 June. Following successful 

 test transmissions in 1962, ice charts were broadcast by facsimile as a 

 regular daily service at 1330 Greenwich mean time on 5320 and 8502 

 kcs. Indications are that several ships with facsimile receivers suc- 

 cessfully copied the Ice Patrol charts with coverage as far as the 

 U.S. coast and 1,200 miles eastward. All transatlantic ships are en- 

 couraged to install facsimile transceivers. The ice information 

 received by facsimile is more reliable than by CW, as human trans- 

 mission and reception errors are eliminated and considerably more 

 information can be transmitted by facsimile in a given amount of 

 time. Also twice-daily ice bulletins were transmitted at 0030 and 

 1230 Greenwich mean time via teletype to U.S. Naval Oceanographic 

 Office, Washington, D.C., Canadian Department of Transport Ice 

 Forecast Central, Halifax, and others for further dissemination. At 

 the request of the U.S. Naval Oceanographic Office, the precedence 

 of the ice bulletins was increased from priority to operational im- 

 mediate to insure reception in time for the U.S. Navy Radio Wash- 

 ington (NSS) 0430 and 1630 daily ice broadcasts. 



Ice Patrol radio station (NIK) worked merchant vessels on 427, 

 6477.5, 8734, and 12718.5 kcs. Ship reports of ice and weather in 

 the Grand Banks area were an indispensable source of ice information 

 and oceanographic and meteorological data which assisted Interna- 

 tional Ice Patrol in determining ice conditions and disseminating 

 pertinent ice information to shipping. Annually after termination 

 of the International Ice Patrol and until commencement the following 



