Andrews 



reported contact area had been made. An experienced member of the 

 analysis team, (Lt. Cdr. George Martin, former pilot of TRIESTE I) 

 determined which of the two values to choose. Figure 4 and 5 show 

 the values of SEP in areas All and AI respectively the day before 

 the weapon was found. Note in Figure 5 that search in AI was far 

 from complete on the day the weapon was sighted in Grid C4. The 

 effect of navigation degradation on the search is covered in detail 

 in Part 2, Chapter V of the final report and shows amongst other 

 factors that if one makes a random search in a given area (A), that 

 (Pp) = 63% when W (sweep width) x L (transit distance) = A (area of 

 nth grid) regardness of the navigation error. In fact, one can do 

 quite well in detection by random search alone. The navigational 

 inaccuracies will, however, impose a severe handicap if one wishes 

 to revisit a contact which has previously been detected. 



The definition of SEP and its use in the method developed on 

 SALVOPS/MED are considered valid and most useful for future deep 

 ocean search operations. However, the particular numbers calculated 

 as shown in Figures 4 and 5 are considered to have unknown 

 inaccuracies because the inputs Pp and Pq were little more than 

 educated guesses. Thus no pre-operational test data were available, 

 nor were any valid on-scene controlled tests performed to check the 

 accuracies of the assumed data. For interest, the values of sweep 

 width (W) and navigational error (a) which were assumed are given 

 in Fig. 6. 



The major recommendation resulting from this analysis phase 

 of the Search and Identification operation were: 



. Establish an Operations Development Group which will 

 develop search tactics, measure search parameters under 

 realistic operational conditions, and improve further 

 the method of operations analysis developed in 

 SALVOPS/MED. 



. Provide all search forces with a trained analysis team 

 and adequate computing facilities. 



. Improve facilities and procedures for obtaining and 

 rapidly displaying environmental information so that 

 the search Commander, search teams, and the analysis 

 team can better assess day by day performance. 

 Quantitative values of bottom currents, bottom sediment 

 and strengths, and the charting of a micro-bathymetry 

 survey are suggested outputs. The current measure- 

 ments made by NAVOCEANO scientists were considered 

 good, but did not cover the area sufficiently. Valid 

 bottom strength and sediment measurements with adequate 

 coverage were made by NCEL scientists, but they could 

 not be processed soon enough nor displayed optimally. 

 A bathymetry survey was made by the USNS DUTTON but 

 showed the usual inaccuracies due to the wide 

 directivity pattern of the UQN fathometer. 



12 



