The equipment required by ships varies according to the sea area in which they operate - ships travelling to the high seas must carry more communications equipment than those which remain within reach of specified shore-based radio facilities.

船舶所需的设备根据其作业海域的不同而有所不同——前往公海的船舶必须携带比指定岸基无线电设施覆盖范围内的船舶更多的通信设备。