1. Theme and Scope of Application This standard specifies the main technical requirements and related terminology for marine radio communication equipment of the Global Maritime Distress Safety System. This standard applies to all passenger ships and ships of 300 Gt (gross tonnage) and above in various maritime navigation areas. 2. Reference standard JT4607 Water Communication and Navigation Terminology 3. Terminology 3.1 Global Maritime Distress and Safety System Navigation Area GMDSS area. In the Global Maritime Distress and Safety System, the world's sea areas are divided into four navigation areas: a. A1 sea area: refers to the area covered by at least one Very High Frequency (VHF) shore station with continuous DSC alarm capability, which can be specified by the governments of each contracting party. b. A2 sea area; Refers to the area covered by at least one medium frequency (MF) shore station with continuous DSC alarm capability, except for the A1 sea area, which may be specified by each contracting party. c. A3 sea area r refers to the area covered by INMARSAT stationary satellites with continuous alarm capability outside of A1 and A2 sea areas. d. A4 sea area; Refers to areas outside the A1, A2, and A3 sea areas. 3.2 Emergency position indicating radio beacon (EPIRB) is a wireless beacon that can automatically or manually transmit distress alarm signals in emergency situations. 3.3 Satellite Emergency Position Indicating Radio Beacon (satellite EPIRB) is an emergency position indicating radio beacon used in satellite mobile services. 3.4 NAVTEX (service) is a service that uses narrowband direct printed telegrams to transmit safety information at sea to relevant ships in English on the internationally specified 518 kHz frequency, and is automatically received by ships. 3.5 Frequency-shift telegraphy F1B telegraphy signal is a communication method that moves the carrier frequency between predetermined values. 3.6 Phase modulation report G1B telegraph signal without modulating subcarriers, which changes the carrier phase between predetermined values without modulating subcarriers
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