(3) The accuracy of the prediction system should be adequate for 

 operational purposes. Supporting computations will be made in 

 the near futiire as part of the continuing research. It has 

 been ascertained, however, that all depression angles in the 

 North American Basin where the technique is applicable, can be 

 predicted with a maximiun error of approximately one half de- 

 gree. This small error suggests that the remaining parameters 

 can also be adequately predicted. 



A final comment about the theoretical significance of this effort is in 

 order. A method often used in approaching the problems discussed here, is 

 to analyze statistically, the distribution of the sound-velocity profiles, 

 and then the corresponding distribution of the computed acoustic parameters. 

 It is currently felt that the errors associated with the techniques just 

 outlined, will, in many cases, eliminate the need and the uncertainties of 

 the statistical approach. 



54 



