GMDSS Radio Signals Radio signals are transmitted as electromagnetic radiation and occupy the frequency range 3 kHz ~ 300 GHz. The radiofrequency range is divided into a number of bands. In the GMDSS system both terrestrial and satellite methods of communications are interlocked in order to provide an extremely reliable scheme to alert rescue authorities in the event of a vessel being in distress.Frequencies in the MF, HF and VHF bands are used for terrestrial communications via Coast Radio Stations (CRS). Frequencies in the SHF bands are used for satellite communications. It's important … [Read more...]
GMDSS Radio Equipment Requirements on Ship as per SOLAS
The GMDSS radio equipment requirements are categorized as following:General Sea area A1 Sea areas A1 and A2 Sea areas A1, A2 and A3 Sea areas A1, A2, A3 and A4 Radio equipment: GeneralEvery ship shall be provided with:VHF radio capable of transmitting and receiving:-DSC on the frequency 156.525 MHz (channel 70) and maintain a continuous watch on the same -Radiotelephony on the frequencies 156.300 MHz (channel 6), 156.650 MHz (channel 13) and 156.800 MHz (channel 16);A search and rescue locating device (SART) capable of operating either … [Read more...]
GMDSS Watches to maintain at sea
In compliance with SOLAS Ch IV, Regulation 12 Every Ship While at sea maintain a continuous watch (GMDSS): 1. Ships complying with regulations under area A1 : on VHF DSC channel 702. Ships complying with regulations under area A2 and A3 : on the distress and safety DSC frequency 2,187.5 kHz3. Ships complying with regulations under area A3 and A4 : on the distress and safety DSC frequencies 2,187.5 kHz and 8,414.5 kHz and also on at least one of the distress and safety DSC frequencies 4,207.5 kHz, 6,312 kHz, 12,577 kHz or 16,804.5 kHz.4. Ships complying with regulations under … [Read more...]