TABLE II- 1 



LONG-RANGE NAVIGATION SYSTEMS 



Estimated Estimated 



System Useful Range Accuracy 



Celestial World-wide ± 3nm 



Star Tracker World-wide ±0.3nm. 



Frequency 

 Range 



Consol 



RDF 



Decca 



Loran-A 



Loran-C 



Omega 



Satellite 



700-1200nm ±0,3-0.6' 



300-600nm 



200-300nm 



700-900nm 



±2-6' 



<0. 25-1.0 



190- 194 kc 

 257-263 kc 



200-415 kc 

 285-325 kc 



Comments 



Inexpensive equipment, easy to 

 use; limited to 2 fixes/day, af- 

 fected by clouds and bad weather, 

 which also limits fix availability 

 to <50%. Star Tracker equip- 

 ment very expensive . 



Requires only a narrow-band 

 communications receiver to 

 establish LOP. 



World-wide coverage . U.S. 

 coastal beacons . Capable of 

 coarse fix only. 



90-130kc Easy to use, insufficient 



coverage, limited to about 240 

 mile range at night because of 

 sky wave interference . 



±0.5-3.0nm 1.75-2mc 



1200-1500nm ±0.2-0.5nm 



Easy to use, insufficient cover- 

 age, subject to sky wave inter- 

 ference. Less accuracy with 

 sky wave. 



90-llOkc Accurate, easy to use, insuf- 

 ficient coverage, expensive 

 installation. Less accuracy 

 with sky wave . 



SOOOnm 



±0.5-1.0nm 10-15 kc 



World-wide ±0.1-2.0nm 



World-wide coverage presently 

 in advanced development. Will 

 use three frequencies to yield 

 both coarse and fine grids . 



100-400mc World-wide coverage; Transit 

 average fix renewal each 110 

 min., presently in advanced 

 development, possibly opera- 

 tional in 1965-1970 period. 

 Less sophisticated systems for 

 commercial use now under study, 



airtliur ai.ltittlc.Unr. 



