F6F AIRCRAFT INSPECTION / 



ALVIN TRACK 



DIVE 302 



24 SEPT. 1968 



DEPTH: 1,690 M 



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SCALE -METERS 



Fig. 10.25 ALVIN's track during F6F aircraft inspection. [From Ref. (28)] 



which sends out its command on one fre- 

 quency; transponders, which receive the in- 

 terrogation signal and respond back to the 

 submersible on different frequencies; and a 

 receiver with the associated inboard equip- 

 ment necessary to acquire and process the 

 transponder signals and convert them to 

 range from the submersible. For greatest 

 accuracy a sound velocity meter is required 



to obtain the local sound structure. In opera- 

 tion, periodic fixes are obtained as the vehi- 

 cle proceeds within the transponder net. A 

 further refinement involves plotting the sub- 

 mersible's track on an x-y plotter. 



A transponder approach was employed by 

 TRIESTE II during the search for the SCOR- 

 PION in 1969. Although the results of this 

 operation, from a navigational point of view, 



511 



