An area, excluding sea area A1, within the radiotelephone coverage of at least one MF coast station in which continuous DSC alerting is available, as may be defined by a Contracting Government. (Nominally in the range of 50-250 n miles)

    指除A1海区以外，至少由一个具有连续DSC报警能力的中频(MF)海岸电台的无线电话所覆盖的区域，该区域可由各缔约国政府规定。