as possible. As was only natural, as the data were analyzed new 

 problems arose which had not been foreseen. New ideas on the 

 subject took shape and the importance of some phases of the work 

 along with the relative unimportance of other phases became ap- 

 parent. Many problems arose in the quantitative analysis of ice 

 berg targets which were entirely different from the problems en- 

 countered in similar programs with other type targets. In view 

 of these new ideas and problems it was felt that further experimen- 

 tation should be conducted. An extensive program was planned 

 for the 1946 ice season. This program called for further study of 

 small bergs and growlers in various sea conditions. It was planned 

 to extend the experimentation to include under water sound and its 

 use in the detection of floating ice. The efi'ect of the weather on 

 the radar detection of ice was to be studied also. 



Unfortunately this extensive program for 1946 was short-lived. 

 The Coast Guard's problems in returning to a peacetime status, 

 with its rapid demobilization plan, prohibited the continuation of 

 plans for the 1946 season. The vessel that was to be assigned as 

 experimental vessel for the 1946 ice season was urgently needed 

 elsewhere. However, a curtailed program was carried out by the 

 U.S.C.G.C. Mojave during the early part of the 1946 season. By 

 the first of May the personnel problem had become so critical that 

 the Mojave could no longer operate in the capacity of experimental 

 vessel. Prior to the ending of the shipboard program three experi- 

 mental cruises were made with the Mojave. Enough data were 

 obtained to help somewhat with the over-all picture of ice detection. 

 A qualitative program with air-borne radar was carried out during 

 the 1946 season much in the same method that the program was 

 carried out during the 1945 season. Here again the primary con- 

 sideration was the practical experience in the use of the air-borne 

 radar available, 



Ship-Borne Radar 



The experimental work with shipboard radar was carried out on 

 the cruises of the Mojave in the Grand Banks area. Bergs, growl- 

 ers, field ice, and ships were sought out as targets for the radar 

 experimentation. Conditions were seldom ideal for this type of 

 work. The weather was often bad. The rough seas and high winds 

 made the ship a very unstable platform. The heavy pitching and 

 rolling resulted in excessive vibration of the radar equipment. The 

 radars were often operated for 24 hours a day as a navigational 

 aid when visibility was reduced to a minimum. Steady use of the 

 radar often prevented the maintenance on the equipment needed 

 to keep it in the peak condition that radar experimental equipment 

 should meet. These conditions were met day after day in the Grand 

 Banks area and had to be taken into consideration when the results 

 were analyzed. 



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