tiple groupings on one cast. 



d. To be so designed that the adverse effects of platforms and 

 sensor motions (horizontal and vertical accelerations) are elimin- 

 ated or minimized considerably. 



e. To be designed to include four (4) interchangeable, modular, 

 depth-sensor units: (1) 0-600 feet, (2) 0-6, 000 feet, (3) 0-15,000 

 feet, (4) 0-39, 000 feet. 



f. Depth accuracy for each module to be * 1/4% of full scale. 



g. Current range and accuracy: 



(1) Speed: 0.05 knot -8.0 knots; ±0.05 knot accuracy at 

 readout. 



(2) Direction: 000-360 ; ±10 accuracy at readout. 



(3) Instrument output should be linear with respect to the 

 current measured over full range of interest. 



(4) Time response: 95% response to speed step-function 

 from zero to 1 knot in 1 second or less. 



h. In designing this instrument, consideration shall be given to 

 utilizing this instrument on other than research or survey ships, i.e., 

 on ships conducting special current studies such as certain fleet 

 units, commercial auxiliaries, oil exploration activities and the like. 



i. Shipboard monitoring components: 



(1) Computer /recorder capable of averaging current over 

 varying time intervals as well as providing instantaneous values. 



(2) Visual analog and digital tape readout. 



(3) Electric or electronic sensor signals must be such as 

 to permit the Master Shipboard Data Logging and Processing Sys- 

 tem to accomplish (1) and (2) above where this data logging and pro- 

 cessing system is installed. Where this system is not installed, 

 separate computing and recording equipment must be available to 

 accomplish (1) and (2) above. 



Potential Users and Estimated Number of Units Which They May 

 Require : 



a. U. S. Navy (basic research, applied research, hydrographic- 

 oceanographic survey ships) - 50 to 250. 



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