All Aviso data are free of charge for non-commercial use, whether online (FTP, Opendap) or on media (DVD). The request must be justified by a short text explaining how the user plan to use the data. This helps Aviso in refining the available data to be better tuned to the users’ needs. For a first level of education, the best is to work with online maps (gif format), e.g. the one available through the Argonautica project, or with the Live Access Server.