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This accession contains the sensor data records (SDRs) from the Geodetic Satellite (GEOSAT) Exact Repeat Mission (ERM) for the time period of November 8, 1986 to December 31, 1989. Parameters include: time, orbit, latitude/longitude, and sea surface height. Corrections to the data include: sea level, wind and wave data, tides, dry and wet troposphere, ionosphere, height bias, altimeter crossover differences, altimeter sea surface measurement, and spacecraft orientation. Data were originally submitted to the NODC by the U.S. Navy via the NOAA National Oceanic Service on 9-track tapes. These current data were recovered from the original 9-track tapes archived at the NODC by Data Recovery International, Inc., Hurst, TX. Reports on non-observation periods and any missing data are listed in the 'about' subfolder for this accession. Data is in ASCII format and is archived with associated documentation in the 'data' folder. The US Navy Geosat radar altimeter mission lasted for nearly 5 years (March 1985 to January 1990) and collected approximately 750 million measurements of sea level, wave height, and wind speed over the global oceans. During the Geodetic Mission (March 1985 to September 1986), the satellite did not repeat its ground track for the duration of the mission. The orbit of the satellite was changed in late 1986 to begin the Exact Repeat Mission (ERM) which lasted from October, 1986 until the satellite quit functioning in January 1990. During the ERM, the satellite repeated its ground track every 17 days. Data were initially processed by the Johns Hopkins University Applied Physics Laboratory in Laurel, MD in coordination with the NOAA/NOS Satellite Altimeter Group. Data products were transferred to the NOAA National Oceanographic Data Center (NODC) for distribution. Additional GOEOSAT data is held at the NODC under separate accession numbers.