submarine to be on the surface. An acoustic method would eliminate this disadvantage, but 

 it would be less accurate and would require modification to the AN/UQC-IA. 



Installation of ARMS, when used solely with the AN/UQC-IA, requires no modification 

 of the submarine equipment. If the 50-kc transmitting capability is used, the transducer must 

 be mounted on the outside of the hull and a cable must lead into the submarine. 



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