Table 7 



Allowable Horizontal Positioning System Criteria 



Positioning System 



Estimated 



Positional 



Accuracy 



Meters RMS) 



Allowable for 

 Survey Class 



1 



2 



3 



Visual Range Intersection 



3 to 20 



No 



No 



Yes 



Sextant Angle Resection 



2 to 10 



No 



Yes 



Yes 



Transit/Theodolite Angle Intersection 



1 to 5 



Yes 



Yes 



Yes 



Range Azimuth Intersection 



0.5 to 3 



Yes 



Yes 



Yes 



Tag Line (Static Measurements 

 from Bank) 

 < 457 m (1500 ft) from baseline 



> 457 m (1500 ft) but < 914 m (3000 ft) 



> 914 m (3000 ft) from baseline 



0.3 to 1 



1 to 5 



5 to 50 + 



Yes 



No 

 No 



Yes 

 Yes 

 No 



Yes 

 Yes 

 Yes 



Tag Line (Dynamic) 

 < 305 m (1000 ft) from baseline 



> 305 m (1000 ft) but < 610 m (2000 ft) 



> 610 m (2000 ft) from baseline 



1 to 3 



3 to 6 



6 to 50 + 



Yes 

 No 

 No 



Yes 

 Yes 

 No 



Yes 

 Yes 

 Yes 



Tag Line (Baseline Boat) 



5 to 50 + 



No 



No 



Yes 



High-Frequency EPS* 

 (Microwave or UHF) 



1 to 4 



Yes 



Yes 



Yes 



Medium-Frequency EPS 



3 to 10 



No 



Yes 



Yes 



Low-Frequency EPS (Loran) 



50 to 2000 



No 



No 



Yes | 



Satellite Positioning: 

 Doppler 

 STARFIX 



100 to 300 

 5 



No 

 No 



No 

 Yes 



No 

 Yes 



NAVSTAR GPS:*" 

 Absolute Point 



Positioning (No SA) 

 Absolute Point 



Positioning (w/SA) 

 Differential 



Pseudo Ranging 

 Differential 



Kinematic (future) 



15 

 50 to 1 00 



2 to 5 

 0.1 to 1.0 



No 



No 

 Yes 

 Yes 



No 

 No 

 Yes 

 Yes 



Yes 

 Yes 

 Yes 

 Yes 



* Electronic Positioning System 

 ** Global Positioning System 



(From HQUSACE (1991)) 



Chapter 3 Field Data Collection and Observation 



57 



