
Block  Launch Period 
Satellite launches  Currently in orbit and healthy 


Suc cess 
Fail ure 
In prep aration 
Plan ned 

I  1978–1985  10  1  0  0  0 
II  1989–1990  9  0  0  0  0 
IIA  1990–1997  19  0  0  0  11 of the 19 launched 
IIR  1997–2004  12  1  0  0  12 of the 13 launched 
IIRM  2005–2009  8  0  0  0  7 of the 8 launched 
IIF  2010–2011  0  0  10  0  0 
IIIA  2014–?  0  0  0  12  0 
IIIB  0  0  0  8  0  
IIIC  0  0  0  16  0  
Total  58  2  10  36  30  
(Last update: 29 December 2009) .PRN 01 from Block IIRM is unhealthy
PRN 25 from Block IIA is unhealthy See the GPS almanac.^
^
^
For a more complete list, see list of GPS satellite launches 
Source  Effect (m) 

Signal arrival C/A  ±3 
Signal arrival P(Y)  ±0.3 
Ionospheric effects  ±5 
Ephemeris errors  ±2.5 
Satellite clock errors  ±2 
Multipath distortion  ±1 
Tropospheric effects  ±0.5 
C/A  ±6.7 
P(Y)  ±6.0 