and night, ani to have an all-weather capability. 



c. The system operation must be reliable, i.e. , have an on- 

 the-air time in excess of 95% and signals must be free of any am- 

 biguity. 



d. To be readily adaptable to automatic plotting of position on 

 a plotting sheet. 



e. To be designed to support a dual-range operational capability 

 as follows: 



(1) Short range (0-ZOO miles); accuracy ±50 feet. 



(Z) Long range (0-5,000 miles); accuracy ±1/2-1 mile. 



f. Shipboard system to be designed ennphasizing modular con- 

 struction, compactness, ruggedness, and ease and simplicity of 

 operation and miamtenance. In any case, ship's crew should be able 

 to operate and service the system at sea without extensive specialized 

 training. If feasible, both short and long range systems should be 

 incorporated into one console. 



g. "Position" information obtained fromi both of these systems 

 must be capable of being read automatically into the Master Ship- 

 board Data Logging and Processing System simultaneously and in 

 conjunction with any environmental data. 



h. Provision also shall be miade for direct "read-in" of "posi- 

 tion" information from both the short and long range system into the 

 Hydrographic Precision Scanning Echo Sounder System. 



i. Geographic Coverage: 



This system(s) must be worldwide, oceanwide; however, the 

 short range system coverage may be limited by shore station site 

 availability. 



Potential Users and Estimated Number of Shipboard Units Which 

 They May Require: 



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

 oceanographic survey ships) - 20 to 40. 



b. U. S. Coast and Geodetic Survey - 10 to 20. 

 394 



