Part 4 

 OPERATIONAL PROCEDURE 



It is worthwhile to explain briefly the technique used for making the 

 aerial stereo-photographs „ 



It is first desired to have a stationary sea free from swell traveling at 

 an angle to the sea so that the data collected could be most easily interpreted. 

 To this ends the Wave Forecasting Branch of the Division of Oceanography, 

 U. S= Navy Hydrographic Office (HYDRO) was consulted. The area around 

 40 Na 65'W was chosen as the most likely place to achieve such resulls and the 

 ATLANTIS was designated to take this position an,d advise periodically on 

 weather, 



HYDRO kept watch on the sea conditionsj and at the appropriate time, 



some 24 hours in advance of the anticipated working time, notified WHOI 



which served as the coordinating center of field activity. NADU and the 



ATLANTIS were alerted, and when the wave situation persisted the planes 



were dispatched. As soon as possible, contact was made between the planes 



and the ATLANTIS, The wave pole and sonobuoy equipment were launched, 



and when the planes arrived on the scene preparation for the exercise was 



complete. Figure 4.1 shows the planes used in the operation. The planes 



took up positions in tandem and |lew at 3000 ft (there was a layer df cumulus 



clouds directly above) upwind in a path such that the ATLANTIS would appear 



in some of the stereo pairs. When the run began, the cameras were "sirnTjrl- 



taneously" triggered by the FM link (figure 4.2), and a series of ten 



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