Canadian Department of Transport, K.C.N. Radio Station, Albro 

 Lake, Nova Scotia, and others for their information and for fui-ther 

 dissemination. 



The principle sources of ice information during the ice season were 

 the ice observation fliglits made by the International Ice Patrol air- 

 craft, reports made by commercial and military vessels, ice reconnais- 

 sance flights by the Canadian Department of Transport in the Gulf of 

 St. Lawrence and Newfoundland coastal waters, by the U.S. Navy in 

 the Labrador Sea and Baffin Bay, and otlier contributors. Merchant 

 ship reports on weather and ice conditions were an indispensable 

 source of information. 



The operations of the International Ice Patrol from 1 March to 28 

 April can be summarized as follows: 



1. Ice Patrol reconnaissance flights were flown for the main pur- 

 pose of guarding the southeastern, southern, and southwestern limits 

 of all ice on the Grand Banks. 



2. Ice reports were collected from ships, aircraft, and other ice ob- 

 serving agencies. 



3. Weather reports, including sea surface temperatures were col- 

 lected from ships. 



4. Ice information was plotted and analyzed. 



5. Ice conditions were forecast twice daily during periods between 

 observed ice conditions. 



6. Ice advisory broadcasts were made twice daily to shipping and 

 transmitted twice daily to interested agencies. 



7. Facsimile transmissions were made once daily to shipping. 



8. Special ice information was provided on request. 



9. Position plots were maintained on all ships reporting in the Ice 

 Patrol area. 



10. Two oceanographic cruises were conducted between 29 March 

 and 25 April 1966 to collect oceanographic data affecting the drift and 

 deterioration of ice. 



U.S.C.G. Cutter Evergreen made two oceanographic check surveys 

 of standard sections in the critical areas of the Grand Banks area to 

 measure the dynamic topography in order to determine the structure 

 of the Labrador Current. A time-series occupation of the Labrador 

 Current was also conducted. Due to the absence of bergs, no drift and 

 deterioration study could be conducted. 



The normal Ice Patrol routine was to estimate the set and drift and 

 deterioration of bergs and field ice from the current maps prepared 

 from oceanographic surveys, semimonthly isotherm charts prepared 

 from sea temperatures reported by shipping and wind data supjilied 

 b^ the U.S. Navy Fleet Weather Facility at Argentia. Witli this data, 

 a current 12 hourly plot on ice conditions is normally maintained and 

 is used in planning ice reconnaissance flights and in issuing the radio 



