Training Devices. 



The development of synthetic training devices ? beginning 

 in 1942s, was one of Division 6's most important contributions 

 to the Navy's program of sonar training; but details about 

 them may not be divulged „ 



The work of the training groups was not confined to the 

 two sound schools. Work outside the schools grew to occupy 

 an important part in sonar training. In 1943 s a training 

 representative was assigned to the Readiness Section., 

 CominChj, Tenth Fleet , Later 9 liaison men were assigned to 

 groups also made frequent visits to other Navy training 

 centers to assist in the installation of training equipment 

 and to help initiate programs for the use of new synthetic 

 trainers 



Operation of New Equipment , 



From the outset it was obvious that the new devices de- 

 veloped by Division 6 laboratories would not be effective in 

 service unless they were handled by operators adequately and 

 specifically trained to use them, Thus^, it became evident 

 that representatives of the laboratories themselves would have 

 to take an active part in instituting training programs for 

 the service personnel who were to operate and maintain the 

 new equipment o In order that laboratory staffs might not be 

 burdened with the additional work of training, groups were 

 organized at the laboratories to work specifically on training 

 problems „ It was the responsibility of these groups to plan 

 training courses, prepare training aids and devices^ and to 

 provide the field services necessary to introduce the train- 

 ing courses at Navy facilities 



Practice Targets. 



During the early months following Pearl Harbor s the sea 

 phase of sonar training was seriously handicapped because every 

 available submarine was needed in active service. Thus was 

 created the problem of designing some sort of synthetic target. 



As has been previously noted s it wa3 very easy for sonar 

 operators to grow rusty. They could not be spared from their 



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