List IV contains important information for the mariner in relation to radiocommunications, including the GMDSS (Global Maritime Distress and Safety System). Detailed information such as the frequencies for transmitting and receiving, in addition to geographical coordinates, is provided for maritime coast radio stations, including those assuming watch-keeping using digital selective calling (DSC) techniques and radiotelephony. List IV also supplies details of additional services such as medical advice, navigational and meteorological warnings, MSI (Maritime Safety Information), AIS (Automatic Identification System), meteorological bulletins and radio time signals, along with the hours of service and operational frequencies, information on port stations, pilot stations, coast Earth stations, VTS stations, contact information of RCC (Rescue Coordination Centers), SAR agencies, Navarea coordinators and AtoNs (AIS Aids to Navigation).

As stipulated in Appendix 16 to the RR, this List shall be provided to all ship stations for which a Global Maritime Distress and Safety System (GMDSS) installation is required by international agreement.

本手册包含了有关海上无线电通信的重要信息，包括全球海上遇险和安全系统(GMDSS)。除了地理坐标外，还包括海岸无线电台的详细资料，如发射和接收频率，包括那些使用数字选择呼叫(DSC)和无线电话值班的电台。同时，本手册还提供了额外服务的详细信息，如医疗咨询、导航和气象警报、MSI(海上安全信息)、AIS(自动识别系统)、气象公告和无线电时间信号，以及服务时和工作频率、港口站、领航站、海岸地面站、VTS站等信息，RCC(救援协调中心)、搜救机构、导航区协调员和自动导航系统(AIS Aids)等的联系信息。

根据《无线电规则》附录16的规定，本手册应提供给要求安装全海上遇险和安全系统(GMDSS)的所有船舶。