Introduction Question 98/8 addresses the updating of electronic charts by the transmission of digital data. In this connection@ the Maritime Safety Committee of IMO transmitted a letter to the Director of the CCIR asking that a study of the most appropriate system and data medium to be used@ involving satellite and terrestrial methods of transmission. The notes and relevant provisional standards of IMO are contained in Annex I to this Report. In addition@ Interim Working Party 8/14@ prepared comments on the satellite-related aspects of data transmission for the purpose of updating ECDIS@ and further suggested that the terrestrial modes of transmission should be studied by Study Group 8.