I. INTRODUCTION 



This report presents a description of and operating instructions for the Submarine 

 Oceanographic Digital Data System which was developed by the U.S. Navy Hydro- 

 graphic Office* and was installed on USS ARCHERFISH (AGSS-Sll) in December 

 1960 following several months testing of various components aboard USS REDFIN 

 (SS-272). 



The System in its complete form is described in Appendix C of Hydrographic 

 Office Special Publication 41 (SP-41)**; however, the installation on ARCHERFISH 

 does not include devices for measuring ambient light, conductivity, and roll angle. 

 The following new concepts in the collection of oceanographic data are employed by 

 this system: First, the operation of equipment Is virtually automatic except for manual 

 introduction of ship's position and switching on and off. Second, the electronic signals 

 received from the transducers are processed in such a manner as to display and record 

 all variables in their ultimate absolute units. Third, the output of the system can be 

 read directly from the digital displays and Is put on digital punched paper tape. This 

 tape can be fed into the Hydrographic Office computer for further analysis. Fourth, 

 data from transducers are recorded simultaneously, and each data sample Includes all 

 the supporting information such as time, date, and submarine position. 



Data collection with the System is associated with general submarine maneuvers 

 (Appendix A)c 



Mode 1 



This mode is used to measure depth of transducers, sound velocity, and sea 

 temperature. 



Mode 2 



This mode is used to measure ambient light as well as those parameters listed 

 In Mode 1 . 



« Submarine Systems Section, Oceanographic Branch. 



wc U.S. NAVY HYDROGRAPHIC OFFICE. SP-41, Special Publication, Oceano- 

 graphic Instrumentation, Final Report of the Committee on Instrumentation. 2d 

 ed. Washington, D. C. 1960. 



