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 0002 00
TM 11-5895-1847-12&P
Rescue Transponder (SART) or the 406 mHz section of a satellite Emergency Position Indicating Radio Beacon
(EPIRB). Both of these items may be carried in the lifeboat. Portable VHF lifeboat radios are used by survivors to
communicate with rescuers on channels 6 or 16.
Maritime Safety Information (MSI)
Information regarding potential navigation or meteorological hazards, weather forecasts and changes or malfunctions
of aids to navigation, such as the Global Positioning System (GPS) or search and rescue information, may be sent via
NAVTEX or INMARSAT-C.
General Communications
General communications between vessels and between vessels and harbor authorities, pilots, Coast Guard, etc., are
also provided for in GMDSS. These communications are made using VHF/FM DSC radio or MF/HF DSC radio.
Provisions also exist for calling a group of vessels using a common, temporary Maritime Mobile Service Identity
(MMSI) and for calling all vessels within a definable geographic area. E-mail and TELEX messages may be sent via
INMARSAT-C.
Bridge to Bridge Communications
Communications between vessels at sea for the purpose of safety and collision avoidance are conducted on VHF/FM
DSC. Ships will normally keep watch on VHF/FM when an imminent risk of collision exists, as well as on the
appropriate DSC frequency. If a potential collision situation exists, it is appropriate to call the ship directly on VHF/
FM in order to agree on appropriate measures to avoid collision. If a vessel is unable to maneuver due to loss of
power, an all ships safety call should be made on DSC channel 70 with a subsequent voice call on channel 16.
0002 00 2
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