(15) Number of ships handled by ground stations: up to 

 20 ships simultaneously per group of ground stations. 



(16) Readout: cathode-ray tube with 6-inch circular sweep. 

 Operator superimposes pulses and reads distance on 



a digital readout to a resolution of 0.01 to 0.001 statute 

 mile . 



(17) Power requirements for transmitter and receiver; 

 115 vac, 400-2600 cps, at 1500 watts 



27 V dc at 400 watts . 



b. Range and Accuracy 



(1) Usable service distance: 25-75 statute miles. 



(2) Approximate accuracy of distance measurement: 30-60 feet 

 except near extreme limits of range . 



(3) Accuracy of LOP: dependent upon absolute magnitude of 

 errors and angle at which distance arcs intersect. Area 

 of uncertainty is negligible when angles of intersection 

 are between 30 and 150°. 



REFERENCES 



1. Cmdr. Clarence A. Burmister, "Electronics in Hydrographic Surveying, " 

 Journal of the Coast and Geodetic Survey, January 1948 . 



2. Lt. Emerson E. Jones, "Shoran Study and Calibration, " Journal of the Coast 

 and Geodetic Survey , April 1949. 



3. Donald A. Rice, "Geodetic Application of Shoran, " Journal of the Coast and 

 Geodetic Survey, April 1950. 



4. Capt. Gilbert R. Fish, Electronic Control Systems used in Hydrographic 

 Surveys , Coast and Geodetic Survey. 



5. Thomas J. Hickley, Radio Wave Propagation as Applied to Shoran, Coast 

 and Geodetic Survey. 



162 



anliur ai.lLittlc.ilnr. 



