There are 3 images added on 3 December 2006
GPS Block I  
Initial Operational Capability (IOC): 1978
Total Production: 11
Origin: United States of America
Corporations: Boeing
Parent System: NAVSTAR
Initial Operational Capability (IOC): 1978
Total Production: 104
Total Cost: USD$7.6 billion
Family Members: GPS Block II, GPS Block IIF, GPS Block III, GPS Block IIIF and GPS Block IIR
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Description: The GPS satellites developed under the NAVSTAR program allows any properly equipped user to determine precise time, velocity and worldwide latitude, longitude and altitude to within a few meters. Originally was designed to be an accurate guidance and navigation tool for the military services but it has been adopted by civil and commercial customers for transportation, surveying and rescue operations. The first GPS Block I spacecraft was put into orbit on February 22, 1978. In the past, the GPS constellation spacecrafts fluctuated from 2-18 to 21 but currently the GPS constellation owned by the United States Air Force consists of 27 satellites (24+3 spares). As of 2004, the US Air Force GPS constellation consists of six planes, each one containing at least four satellites operating 24/7. Redundant satellites are being launched as spares to counterbalance attrition. The GPS is transitioning into the 2020s and the 2030s with the GPS Block III and Block IIIF satellites.

The Rockwell International GPS Block I space vehicles were launched from 1978 to 1988 totaling 12 satellites. These satellites were intended for testing and to validate the Global Positioning System feasibility.

GPS Block I Specifications

Orbit: 20,200 kilometer (12,554 mile)
Positioning Accuracy: 10 meter
Service Life: 5 year (1,825 day)
CEP: Circular Error Probable
Meters (m)   Kilometers (km)   Nautic Miles (nm)   Inch (in)   Yard (yd)   Foot (ft)   Millimeter (mm)
Pound (lb)   Kilogram (kg)   kN (KiloNewton)   Ton (t)
Meters per Second (mps)   Kilometers per Hour (kph)   Knot (kt)   Miles per Hour (mph)
Liter (l)   Galon (gl)
Year (yr)   Minutes (min)   Second (sec)
Shaft-Horse-Power (shp)

GPS Block I News

There are 4 news between
17 Mar 2007 and 30 Mar 2012
Friday, March 30, 2012NPO Progress Introduces New Navigation System for T-72 and T-90 Tanks
Monday, April 25, 2011Boeing-built GPS Operational Control Segment Enters Service with US Air Force
Tuesday, February 26, 2008Boeing GPS Ground Control System Keeps Navigation Satellites Operational
Saturday, March 17, 2007Oldest GPS Satellite Being Prepared for Disposal

Operators & Related Equipment


Grand Total 111
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