GFO, <link internal-link>Geosat Follow-On was launched in February 1998. Its mission is to provide real-time ocean topography data to the US Navy. Scientific and commercial users have access to these data through Noaa. Its primary payload is a radar altimeter.

GFO follows the 17-day repetitive orbit of Geosat. After an onboard problem of overheating reaction wheels in September 2008, GFO's transmitter was turned off for the final time the November 26, 2008.

Further information on :

• <link http: www.aviso.oceanobs.com en news-storage news-detail _top external-link-new-window>GFO, the end of a long run (November 2008).
• M.I. Pujol, OST/ST 2008, GFO contribution to multi-satellite applications and statistical performance assessment, <link fileadmin documents ostst pujol_gfo.pdf poster download>pdf.
• <link http: gfo.bmpcoe.org gfo default.htm _blank external-link-new-window>mission and operations (US Navy website)
• <link http: ibis.grdl.noaa.gov sat gfo _blank external-link-new-window>data (Noaa website)