Inmarsat-C is the most efficient system for store and forward text messaging available, as well as for telemetry and tracking, at remarkably low operational cost. Inmarsat-C is globally acknowledged by International Maritime Organization (IMO) as a complete maritime safety and distress system according to Global Maritime Distress and Safety System (GMDSS) requirements. The GMDSS is an internationally agreed-upon set of safety precedures, types of equipment, and communication protocols used to increase safety and make it easier to rescue distressed ships, boats and aircraft.
It is not possible to use this system for any voice communication.

When sending a ship-to-shore message, the message is initially prepared locally and then transmitted via the Inmarsat satellite in a series of data packets to an Inmarsat-C land earth station (LES). The LES stores the message briefly before forwarding it over the telecommunication networks to the intended destination (hence the term store-and-forward). A similar procedure happens when a shore-based correspondent sends a message through an LES to your terminal.

The following services are available via the Inmarsat-C network:

Store-and-forward messaging services

The Inmarsat-C network can be used for sending different types of store-and-forward messages:

• Telex message service. You can send and receive messages between your MES and any telex terminal connected to the national/international telex network;

• Fax messaging service. This allows an MES to send text messages to a shore-based fax machine. It is not possible for a shore-based fax user to send messages directly to an MES. A fax message can only be sent as a text message via a fax bureau service;

• Messages to and from a computer. You can send and receive messages between your MES and any computer terminal connected to the PSTN or PSDN network. For shore-to-ship traffic you need to be registered with an Inmarsat service provider to get access to the service required;

• e-mail services. Messages can be sent via either the Internet or hub services;

• Dedicated data processing systems connected via a private network (such as a leased line);

• Ship-to-ship communications;

Distress alerting and distress priority messaging

Every Inmarsat-C LES is connected by a reliable telecommunications link to a rescue coordination centre (RCC) known as the "associated RCC". RCCs are equipped with facilities to organise search and rescue activities in response to a distress alert or distress priority message being received from an MES. Each associated RCC is connected by the international telecommunication networks to other RCCs around the world and is also equipped with Inmarsat terminals, enabling it to communicate with other rescue centres and ships in the vicinity to ensure that rapid assistance is given.

Enhanced Group Call (EGC) services

The SafetyNET^ΤΜ service allows an information provider (e.g. a meteorological or hydrographical office or an RCC) to broadcast Maritime Safety Information (MSI) to all vessels in fixed geographical areas such as the IMO-defined NAVAREAs or METAREAs or to pre-determined areas.
The FleetNET^ΤΜ service allows information providers such as shipping companies or governments to broadcast commercial information addressed to a selected group of EGC receivers belonging to a closed user group (a special list of subscribers / customers).

To download the Service Activation Registration Form (SARF) Maritime please click here.
To download the instructions for filling in the SARF Maritime please click here.

 

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