GMDSS

The Global Maritime Distress and Safety System is the global emergency and safety system that came into force on 1 February 1999. The system applies to all ships larger than 300 GRT. as well as passenger ships in international traffic.

GMDSS is based on satellite and digital communication and is a replacement for the old analog system, which operated on 2182 kHz and VHF channel 16. The cornerstones of the system are built on requirements that follow from the sea areas named:

MF DSC

Medium wave DSC is a digital calling system that is used both commercially and as an emergency and security system.

In Greenland, A2 sea areas have been established covered by selected transmitters on medium-wave DSC. The Greenlandic DSC system only functions as an emergency and safety system on the frequency 2187.5 kHz. The A2 sea area broadly covers the coastline from north of Upernavik to the coast north of Tasiilaq at a distance of up to approx. 300 nautical miles from the coast.

VHF DSC

Like MF DSC, VHF DSC is built as a digital system. The system is used for emergency and safety systems, but also commercially.

Inmarsat

In GMDSS, the Inmarsat system is an emergency and safety system that covers the globe between approx. 76º north latitude and approx. 76º south latitude.

The range is limited by Inmarsat's geostationary satellites.

There is a wide range of ship earth stations and land station stations to cover shipping needs for communication.

However, the Inmarsat system can also be used commercially for calls and telegrams.

You can find further information about Inmarsat's role in GMDSS on Inmarsat's website: inmarsat.com.

Iridium

Iridium is a new GMDSS system available on same terms as Inmarsat from 2024. The system applies to all sea areas as it is built on circumnavigating satellites.

NAVTEX

NAVTEX is a 518 kHz medium wave system that transmits weather alerts, navigation alerts and retransmissions of emergency messages.

NAVTEX works practically as a receiver that automatically prints the messages on a piece of paper. The equipment can also be purchased as a small box that connects to a PC.

The normal range for NAVTEX is approx. 400-500 nautical miles.

The following NAVTEX stations should be able to be used near Greenland:

NAVTEX STATION

IDENTIFICATION LETTER

TRANSMISSION TIMES UTC

Bodø Radio, Svalbard

A

0000, 0400, 0800, 1200, 1600, 2000

Eqaluit Radio

T

0310, 0710, 1110, 1510, 1910, 2310

Kook Island, Nuuk

W

0340, 0740, 1140, 1540, 1940, 2340

Labrador

X

0350, 0750, 1150, 1550, 1950, 2350

Reykjavik Radio, Saudanes

R

0250, 0650, 1050, 1450, 1850, 2250

Reykjavik Radio, Grindavik

X

0350, 0750, 1150, 1550, 1950, 2350

Simiutaq, Qaqortoq

M

0200, 0600, 1000, 1400, 1800, 2200

Upernavik

I

0120, 0520, 0920, 1320, 1720, 2120

The operating authority for the Greenlandic broadcasts at stations M, I, X, R and W is JRCC NUUK.

EPIRBs

For GMDSS, requirements for a number of different emergency radio transmitters depend on the sea area the ship is sailing on and the ship's size, species and manning.

In A3 sea areas, so-called Inmarsat EPIRBs are used, which are capable of automatically transmitting the ship's identity and position. Inmarsat EPIRBs are in the new versions made with built-in GPS receiver.

In all sea areas, so-called COSPAS / SARSAT EPIRBs can be used, which are based on a Russian / American collaboration on satellites that orbit the earth polarly.

The COSPAS / SARSAT EPIRBs use the frequency 406MHz.

On 406MHz, the position indications of the EPIRBs are accurate to within 5 km.

In addition, the 406MHz EPIRBs also pass on the ship's identity to the rescue authorities.

In all sea areas you can also use a so-called SART. A SART is an emergency radio transmitter that, when activated, can respond to ships' 3 centimeters of radar. Newer SART are built in with an AIS transmitter.

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