This data set contains mapped and gridded data from TOPEX/Poseidon (NASA/CNES), Jason-1 (CNES/NASA), ERS-1, ERS-2 and Envisat (ESA). At any given time data from all available satellites is included in the mapped and gridded data product. At times only data for TOPEX/Poseidon is available. This is indicated in one of the fields in the data file. Data comes from TOPEX/Poseidon and ERS-1/2 up until about June, 2003. After that data comes from the follow-on missions - Jason-1 and Envisat. The data is on a 1 degree Mercator grid - the longitude grid spacing is always 1 degree. The latitude grid spacing is 1 degree at the equator, but gets smaller with distance from the equator. This data set is in a relatively easy to use format. The data was provided by Aviso/CNES in France and has been reformatted into a netCDF file at CSIRO Marine Research in Hobart. Available on-line on the CSIRO Marine Research network; also available to outside users on request.