Who knows what does the GMDSS?

SOLAS requirement for Global Maritime Distress Safety System (GMDSS) Transmission of distress signal from ship to shore by at least two separate and independent methods Every ship under GMDSS must have at least two separate communication method for ship to shore distress transmission from the following- EPIRB , Digital Selective Calling (DSC), Inmarsat C. Receiving of distress alert from shore to ship Every ship under GMDSS must be capable of receiving shore to ship warnings and distress alerts by either of two means- DSC and NAVTEX. Transmission and receiving of distress alerts in between ship to ship Every ship under GMDSS must be capable of transmitting and receiving distress signal between ship to ship by two methods – VHF channel 13 and DSC. Transmission and receiving of search and rescue coordinating communications Every ship under GMDSS must be capable of receiving and transmitting search and rescue coordinating communications by any of the following means- NAVTEX, HF/MF/VHF, Inmarsat. On scene communication transmission and receiving Every ship under GMDSS must meet the requirements to co-ordinate search and rescue and other distress communication in between vessels at the scene of incident. Normally MF/HF or VHF is used. Transmitting and receiving signals for locating Ship under GMDSS must be fitted with proper approved equipment for maritime distress operation and as described in SOLAS chapter V like radar etc. Transmission and receiving of maritime safety information Every ship under GMDSS must be capable of receiving maritime safety information through services like navigation warnings, chart correction, weather forecast and warning, distress alerts etc by means of NAVTEX and DSC General radio communication to be transmitted and received from shore based networks Ship under GMDSS consist of a general communication system for official, business, personal and private crew communications and can be done by means of DSC and Inmarsat. Transmission and receiving of communication between bridge to bridge Ship under GMDSS must have a system to communicate bridge to bridge, which is normally done at port or pilot-age by means of VHF for normal range and MF/HF or Inmarsat for longer range.