COMMUNICATIONS 



Ice Patrol communications included ice reports, 

 environmental conditions, Ice Bulletins, special 

 ice advisories, a daily facsimile chart, and the 

 administrative and operational traffic necessary 

 to the conduct of the Patrol. The Ice Bulletin 

 was transmitted by teletype from the Third Coast 

 Guard District Communications Center in New 

 York twice each day to over 30 addresses, includ- 

 ing those radio stations which broadcast the 

 Bulletin. These stations were the U.S. Coast 

 Guard Communications Station Boston/NIK/ 

 NMF, U.S. Naval Radio Station Norfolk NAM. 

 Canadian Coastal Radio Station, St. John's/VON 

 and Canadian Forces Maritime Command Radio 

 Station, Mill Cove/CFH. 



Coast Guard Communications Station Boston 

 transmitted the Bulletin by CW at 0018 GMT on 

 5230 and 8502 kHz and at 1218 GMT on 8502 and 

 12750 kHz. After a 2-minute series of test sig- 

 nals the transmissions were made at 25 words per 

 minute and then repeated at 15 words per minute. 

 Coast Guard Communications Station Boston/ 

 NIK also transmitted a daily radio facsimile 

 broadcast depicting the locations of icebergs and 

 sea ice at 1600 GMT simultaneously on 8502 and 

 12750 kHz at a drum speed of 120 revolutions 

 per minute. 



Ice Bulletins were also broadcast via CW twice 

 daily by U.S. Naval Radio Station Norfolk/ 

 NAM at 0430 and 1700 GMT on 88.0 (except the 

 Tuesday 1700 GMT transmission was made on 

 134.9 kHz), 8090, 12135, 16180, 20225 (1700 GMT 

 only) and 25590 (1700 GMT only) kHz; Cana- 

 dian Maritime Command Radio Station Mill 

 Cove/CHF at 0130 and 1330 GMT on 438 (except 

 the 1330 GMT transmission the second Thursday 

 each month), 4356.5, 6449.5, 8662, 12984, 17218.4 

 and 22587 (on request) kHz; and Canadian 

 Coastal Radio Station St, John's/VON at 0000 

 and 1330 GMT on 478 kHz. Radio facsimile 

 broadcasts that included the limits of icebergs 

 were made by Fleet Weather Central Norfolk/ 

 NFAX at 1805 GMT on 4957, 8080, 10865, 16410 

 and 20015 kHz; Canadian Maritime Command 



Radio Station Mill Cove/CHF at 0000 and 1200 

 GMT on 133.15, 4271, 9890, 13510 and 17560 kHz; 

 Radio Station Bracknell/GFE at 1400 GMT on 

 4782, 9203, 14436 and 18261 kHz; and Radio 

 Station Hamburg/DGC and Radio Station 

 Pinneburg/DGN at 0905 and 2145 GMT on 

 3695.3 and 13627.1 kHz. All radiofacsimile 

 broadcasts were made at a drum speed of 120 

 revolutions per minute. 



Special broadcasts were made by Canadian 

 Coastal Radio Station St. John's/VON as re- 

 quired when icebergs were sighted outside the 

 limits of ice between regularly scheduled broad- 

 casts. These transmissions were preceded by the 

 International Safety Signal (TTT) on 500 kHz. 



Merchant ships calling to transmit ice sight- 

 ings, weather and sea surface temperatures were 

 requested to use the regularly assigned interna- 

 tional call signs of the Coast Guard Ocean 

 Weather Station HOTEL, East Coast AMVER 

 Radio Stations, or Canadian Coastal Radio Sta- 

 tion St. John's/VOX. All Coast Guard Stations 

 were alert to answer NIK/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 Department of the 

 Environment from December until approximately 



Table 2 — Communications Statistics 



Number of ice reports received 



from ships 192 



Number of ships furnishing ice reports 101 



Number of ice reports received from 



commercial aircraft 5 



Number of sea surface 



temperature reports 1050 



Number of ships furnishing sea surface 



temperature reports 57 



Number of ships requesting special 



ice reports 10 



Number of NIK Ice Bulletins issued 224 



Number of NIK facsimile broadcasts 111 



