TABLE II-3 



SHORT-RANGE NAVIGATION SYSTEMS 



Estimated Estimated Frequency 

 System Useful Range Accuracy Range 



Shoran 25-75 nm 100-250 ft 210-320 mc 



Alpine Dependent 

 Precision upon ship's 

 Radar radar being 



Ranging used 

 Unit 



± 80 ft 



Radar 



200 ft to 

 50 nm 



Autotape 1 00 m to 

 100 km 



Hydrodist 40 km 



1:2500 



± 1 - 2 m 



± 1.5 m 



3 -cm band 



3- and 10- 

 cm band 



10-cm 

 band 



10-cm 

 band 



Hi-Fix 50-lOOnm ±2.5-40ft 2 mc 



Comments 



A high -accuracy standard 

 control method for near- 

 shore surveys, used since 

 1945. 



System complements stand- 

 ard ship's radar. Includes 

 accurate time base, digital 

 readout and display, track - 

 plotting and transponder 

 equipment . 



Moderate ranging accuracy . 

 Used for general search, 

 hazard warning, harbor con- 

 trol, etc . 



2 portable shore responders 

 required. Automatic rang- 

 ing and tracking capability • 

 Digital output and track -plot- 

 ting equipment available . 



2 portable shore responders 

 required. Since automatic 

 ranging, manual tracking, 

 digital output and track - 

 plotting equipment available . 



2 or 3 portable shore sta- 

 tions required; both ranging 

 and hyperbolic mode avail- 

 able . Decimal counter dis - 

 play; automatic plotting 

 equipment available . 



atthxtr Zn.lLittlf.Ilnr. 



