PREFACE 



This report is the 57th in a series of annual reports on the 

 International Ice Patrol Service in the North Atlantic Ocean. It 

 contains information on Ice Patrol organization, communications, 

 and operations and on ice and environmental conditions which existed 

 during the 1971 International Ice Patrol year. 



The author of this paper. Commander Eugene A. DELANEY, USCG 

 acknowledges ice and weather data provided by the Canadian Atmospheric 

 Environment Service, weather and oceanographic data provided by the 

 U. S. Naval Weather Service, and oceanographic data provided by the 

 U. S. Coast Guard Oceanographic Unit. Acknowledgement is also made 

 to Senior Chief Marine Science Technician P. Riley FLOWERS, Marine 

 Science Technician First Class James A. SHAFER, and Yeoman Second 

 Class Bruce S. COLLINS of the United States Coast Guard for their 

 assistance in the preparation of the manuscript and illustrations for 

 this report. 



The final section of this Report is a paper by Lieutenant Commander 

 Charles W. MORGAN, U.S. Coast Guard, the assistant Ice Patrol Officer 

 during the early portion of this season, entitled Long Term Trends in 

 the Iceberg Threat in the Northwest Atlantic . 



