Geodynamics and Experimental Ocean Satellite (GEOS) is the third of the NASA’s geodetic mission program GEOM. It was launched in April 1975 and continued gathering data for more than 3 years, until July 1979. The satellite was designed to detect gravitational anomalies as well as ocean’s mesoscale circulation. Its orbit was non-Sun-synchronous, with an inclination of 115°.
| Agency | NASA |
| Launch date | 1978-06-16 |
| EOL date | 1993-07-01 |
| Mass | 340 kg |
Geos-3
| Eccentricity | 0.00115 |
| Inclination [deg] | 115 ° |
| Mean Height | 840 km |