The List of Coast Stations and Special Service Stations (List IV) is a service publication prepared and issued, every two years, by the International Telecommunication Union (ITU), in accordance with provision No. 20.7 of the Radio Regulations (RR). Information published in this List is based on the data provided by administrations of its Member States to the ITU. Changes to operational information and station particulars contained in this List are to be notified immediately to the Radiocommunication Bureau (BR) by administrations, as provided for in provision of No. 20.16 of RR: Administrations shall take all appropriate measures to notify the Radiocommunication Bureau immediately of any changes in the operational information contained in Lists IV and V in view of the importance of this information, particularly with regard to safety. In the case of the data published in List V which is also made available online through MARS, administrations shall communicate those changes at least once a month. In the case of other publications, administrations shall communicate the changes in the information contained in them as soon as possible. The carriage requirements, of this List on board ships, are stipulated in Appendix 16 to the RR. Errors and omissions observed in this List should be brought to the attention of the telecommunications administration having jurisdiction over the station(s) concerned so that the appropriate amendments can be transmitted to the ITU through official channels. Reports on errors or omissions addressed directly to the Office of the Director will be forwarded to the administration concerned for confirmation.