AERIAL ICE RECONNAISSANCE 



Seventy six ice observation flights were made 

 during the season. Radar aided the ice observ- 

 ers in locating possible icebergs in bad visibility 

 and doppler navigation was used to determine 



the position of ice. During parts of the Patrol, 

 microwave radiometer was available to aid in 

 identifying radar targets in bad visibility. 

 Flight statistics are presented in Table 1. 



Table I. — Aeriol Ice Reconnaissance Statistics — September 1967 through August 1968. 



Month 



No. of 

 flights 



No. days 

 flights made 



Average visual 

 effectiveness 

 (percentage)** 



Maximum number 



days between 

 flights 



Hours 

 flown 



Sep 1 



Oct 



Nov 



Dec 1 



Jan 1 



Feb 4 



Mar 10 



Apr 15 



May 20 



Jun 13 



Jul 14 



Aug 2 



NA 



NA 



NA 



NA 



NA 



4 



10 



15 



16 



13 



12 



2 



90.0 

 NA 

 NA 

 50.0 

 90.0 

 75.0 

 84.5 

 60.0 

 59.6 

 62.3 

 52.0 

 92.5 



' Ratio ( X 100' of area actually searched visually to area planned to be searched. 



Table 2. — Communication Statistics. 



Number of ice reports received 398 



Number of ships furnishing ice reports 178 



Number of sea surface temperature reports 2271 

 Number of vessels furnishing sea surface 



temperatures 327 



Number of vessels requesting special 



information 47 



Percentage Distribution of Reporting Vessels by Nationality 



United Kingdom 33.8 



United States of America 12.9 



Federal Republic of Germany 12.5 



Norway , 6.5 



Sweden 5.3 



France 4.9 



Netherlands 3.8 



Union of Soviet Socialist Republics 3.4 



Table 2. — Communication Statistics. — Conf. 



Percentage Distribution of Reporting Vessels by Nationality— Conf. 



Liberia 3.0 



Italy 2.3 



Canada 1.5 



Ireland 1.5 



Japan 1.5 



Belgium 1.5 



Finland 1.1 



Yugoslavia 1.1 



Poland 0.7 



Nigeria 0.7 



Spain 0.4 



Panama 0.4 



Denmark 0.4 



India 0.4 



Mexico 0.4 



Total 100.0 



