2. Maritime Safety Information Under the Gmdss
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Transcript of 2. Maritime Safety Information Under the Gmdss
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7/31/2019 2. Maritime Safety Information Under the Gmdss
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Maritime SafetyInformation Under
the GMDSS
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Background
The GMDSS makes specificrequirements with regard to radioequipment, and ships must be able tocarry out several different functions,one of which is the ability toTRANSMIT and RECEIVE MaritimeSafety Information (MSI)
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Maritime Safety Information (MSI)
Navigational reports Meteorological reports
Weather Forecasts
Messages of General Importance
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MSI is transmitted via the ff:
NAVTEX
Inmarsat EGC system
Radio Telex (NBDP)
Radio telephony (Safety Messages)
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Navtex system MSI
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The NAVTEX System
Navtex system could reach up to a
distance 600 nm offshore. 518 kHz is the International navtex
frequency
24 Navtex stations in one NAVAREA
The 24 stations are divided into 4groups consisting of 6 transmittingstations.
Every group is allowed one hourtransmission time. (10mins/4 hours)
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NavareasThere are 16 Navareas worldwide.
Navtex stations are geographicallyseparated.
Every Navtex station has its own
identification character (A-Z).Navtex stations coverage is shown in
the ITU List of Radio Determination
and Special Service StationsThe Navtex coordinator in each Navarea
decides which MSI messages the system
is to broadcast.
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Navtex Stations Worldwide
Click toplay video
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The Navtex Coordinator Coastguard
Buoyage authority
Electronic Navaids
Offshore Operator
Government dept.
Ship reports NAVAREA co-ordinator
National Coordinator
Ice Monitoringmeteorological
offices
Initial distressmessage
Navigationalwarningco-ordinator
Meteorologicalmessageco-ordinator
SARco-ordinator
NAVTEXcoordinator
Transmitter
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Building up a Navtex message
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ZCZC B1 B2 B3 B4
Message Origin .
..
NNNN
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The Subject Indicators (B2)A= Navigational Warnings (cannot be rejected by the
receiver)
B = Meteorological Warnings (cannot be rejected by thereceiver)C = Ice ReportsD = Search and Rescue information (cannot be rejected by
the receiver)E = Meteorological ForecastsF = Pilot Service MessagesG = DECCA MessagesH = LORAN MessagesI = OMEGA MessagesJ = SATNAV Messages
K= Other Electronic Navaid Messages (messages concerningradio navigation services)L = Navigational Warnings for mobile drilling rig movements
(cannot be rejected by the receiver)V = Amplifying navigational warning information initially
announced under AZ = No messages on hand
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------------------------------------------------------------
ZCZC GA20
ORKNEY ISLANDS
LOTHER ROCK RACON 58.44N 02.49W
TEMPORARILY OFF AIR
NNNN
-------------------------------------------------------------
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ZCZC GL67
RIGMOVE. SOUTHERN NORTHSEA.
CHARLES ROWAN AT 54-19N 02-07.7E
CANCEL THIS MESSAGE 121020 Z FEB 25
NNNN
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ZCZC PB68
NETHERLANDS COASTGUARD GALE
WARNING NR. 55 180630 FEB
DOVER THAMESSOUTH 8
OTHER DISTRICTSNO WARNINGS
NNNN
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