The NMCN6L3GARP is the Nimbus-6 Level 3 NMC Data Systems Test for the Global Atmospheric Research Program (GARP) product. The product consists of meterological parameters, such as relative humidity, temperature, wind speed, etc. an a regular lat/lon grid reported every 12 hours. Data Systems Tests (DST) 5 and 6 were conducted to assess the NMC's numerical analysis and forecasting, and to determine the impact of meteorological satellite data from Nimbus-6 HRIR and SCAMS. DST-5 ran for the period of 30 August to 4 September 1975, and DST-6 was conducted from 29 February to 3 March 1976. The data were recovered from the original magnetic tapes, and are now stored online as orbit files in their original proprietary binary format with a days worth of data. These data were previously archived at NASA NSSDC under the entry ID ESAD-00094 (old id 775-052A-02B).