PREFACE 



This report is 56th 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, on ice and environ- 

 mental conditions and their relationship in 1970, and an analysis of preseason 

 iceberg surveys made by the U.S. Coast Guard since 1948. 



The authors of the report acknowledge ice and weather data supplied 

 by the Canadian Department of Transport, weather data supplied by the 

 U.S. National Weather Service, and oceanographic data supplied by the U.S. 

 Coast Guard Oceanographic Unit. Acknowledgement is also made to Yeoman 

 Second Class Roy J. M0FFP:TT, USCG, Marine Science Technician Third 

 Class John D. JENNE, USCG, and Marine Science Technician Third Class 

 Robert O. LAPREY, USCG, for assistance in the preparation of the manu- 

 script and illustrations for this report. 



