Navigation experiments. Space craft engaged in investigation of spaceflight techniques and technology (US Cat A).

Space craft engaged in investigation of spaceflight techniques and technology (US Cat A).

Demonstrated navigation technologies. Spacecraft engaged in practical applications and uses of space technology such as weather or communication (US Cat C).

Navigation Technical Satellite; GPS precursor. Space craft engaged in investigation of spaceflight techniques and technology (US Cat A).

Also known as Navigational Development Satellite 1. Space craft engaged in investigation of spaceflight techniques and technology (US Cat A).

Also known as Navigational Development Satellite 2. Space craft engaged in investigation of spaceflight techniques and technology (US Cat A).

Space craft engaged in investigation of spaceflight techniques and technology (US Cat A).

Spacecraft engaged in practical applications and uses of space technology such as weather or communication (US Cat C).

Spacecraft engaged in practical applications and uses of space technology such as weather or communication (US Cat C).

USAF. Spacecraft engaged in practical applications and uses of space technology such as weather or communication (US Cat C).

Global Positioning System.

Global Positioning System. Spacecraft engaged in practical applications and uses of space technology such as weather or communication (US Cat C).

GPS. Spacecraft engaged in practical applications and uses of space technology such as weather or communication (US Cat C).

Spacecraft engaged in practical applications and uses of space technology such as weather or communication (US Cat C).

Spacecraft engaged in practical applications and uses of space technology such as weather or communication (US Cat C).

Second generation Global Positioning System. Spacecraft engaged in practical applications and uses of space technology such as weather or communication (US Cat C).

Global Positioning System. Spacecraft engaged in practical applications and uses of space technology such as weather or communication (US Cat C).

Global Positioning System. Spent boosters, spent maneuvering stages, shrouds and other non-functional objects (US Cat D).

Global Positioning System. Spacecraft engaged in practical applications and uses of space technology such as weather or communication (US Cat C).

Global Positioning System. Spacecraft engaged in research and exploration of the upper atmosphere or outer space (US Cat B).

Global Positioning System. Spent boosters, spent maneuvering stages, shrouds and other non-functional objects (US Cat D).

Global Positioning System. Spacecraft engaged in research and exploration of the upper atmosphere or outer space (US Cat B).

Global Positioning System. Spacecraft engaged in research and exploration of the upper atmosphere or outer space (US Cat B).

Global Positioning System. Spacecraft engaged in research and exploration of the upper atmosphere or outer space (US Cat B).

Global Positioning System. Spacecraft engaged in practical applications and uses of space technology such as weather or communication (US Cat C).

Global Positioning System. Spacecraft engaged in research and exploration of the upper atmosphere or outer space (US Cat B).

Global Positioning System. Spacecraft engaged in research and exploration of the upper atmosphere or outer space (US Cat B).

Global Positioning System. Spacecraft engaged in research and exploration of the upper atmosphere or outer space (US Cat B).

Spacecraft engaged in practical applications and uses of space technology such as weather or communication (US Cat C).

Spacecraft engaged in practical applications and uses of space technology such as weather or communication (US Cat C).

Global Positioning System. Spacecraft engaged in practical applications and uses of space technology such as weather or communication (US Cat C).

Global Positioning System. Spacecraft engaged in practical applications and uses of space technology such as weather or communication (US Cat C).

Global Positioning System. Spacecraft engaged in practical applications and uses of space technology such as weather or communication (US Cat C).

Spacecraft engaged in practical applications and uses of space technology such as weather or communication (US Cat C).

Global Positioning System. Spacecraft engaged in practical applications and uses of space technology such as weather or communication (US Cat C).

Global Positioning System. Spacecraft engaged in practical applications and uses of space technology such as weather or communication (US Cat C).

Global Positioning SYstem. Spacecraft engaged in practical applications and uses of space technology such as weather or communication (US Cat C).

Global Positioning System. Spacecraft engaged in practical applications and uses of space technology such as weather or communication (US Cat C).

Final element of initial GPS constellation. Spacecraft engaged in practical applications and uses of space technology such as weather or communication (US Cat C).

MEO.