Click here for a transmission schedule for full GMDSS Service.
The U.S. Coast Guard Navigation and Vessel
Inspection Circular (NVIC) 3-99 on GMDSS and EPIRB
Equipment Requirements on
Commercial Vessels is available in Acrobat (PDF) format. It replaces NVIC 9-93.
Operation of a shipboard radio installation requires a license and is regulated
by the FCC. The exception to this is the Telecommunications Act of 1996 permits recreational boaters to have and use a VHF marine radio. For further information, see the
FCC's Wireless Telecommunication Bureau's Maritime Mobile Service Webpage.
Licensing is not normally required when receiving only. Learn more about GMDSS and other marine communication systems by visiting the U.S. Coast Guard Maritime
Telecommunications Information webpage.
Under GMDSS regulations, reception of MSI is
"While at sea, vessels must maintain radio watches for broadcasts
of maritime safety information on the appropriate frequency or frequencies
on which such information is broadcast for the area in which the ship is
navigating." 47 CFR 80.1123(b).
Waivers for inoperative GMDSS equipment which can not be repaired prior
to scheduled sailing should be requested of the FCC by phone or email to
Ghassan Khalek (202-418-2771, email@example.com, 202-418-2643(fax)) identifying other systems
available, planned repair date, duration of next voyage, destination etc.
Also under U.S. GMDSS regulations,
"Ships must carry the most recent version edition of the IMO
publication entitled GMDSS Master Plan of Shore Based Facilities".
47 CFR 80.1085(ii)(d).
This document is available from the
FCC allows NGA Publication 117
to be carried as an alternative to the GMDSS Master Plan.
Refer to NGA Publication 117, which is updated
through the Notice to Mariners, for the latest official listing of
NAVTEX and SafetyNET broadcast schedules. The
British Admiralty List of Radio Signals is an excellent reference
source for GMDSS information.
All NWS marine forecasts rely heavily on the Voluntary
Observing Ship (VOS) program for obtaining meteorological observations.