system requires the user (at either end) to prepare the message/data on their end terminal (PC) and transmit it via the Inmarsat C system. After a delay of a few minutes, the message may be viewed, printed and/or stored. Any person familiar with electronic mail systems, including Internet e-mail, will readily understand how Inmarsat C functions to deliver and receive a message. Shore-based service providers offer Internet e-mail connection and regularly updated weather reports, stock market information, medical information, and news. It also makes possible a range of services such as data reporting, position reporting, and polling. Vessel operators can program their C satcom to transmit regular data reports, including GPS coordinates, on the condition of their vessel and other operational information to shore-based offices. Alternatively, shore-based managers and families of the yacht operator can 'poll' or interrogate the vessel, automatically or manually, for receiving the same type of information. Coupled with its Enhanced Group Call (EGC) capabilities, vessels are able to automatically receive a category of messages known as SafetyNET^TM . This service is directed to vessels in or approaching specific geographic regions such as the area around a storm warning, hazard to navigation, or a ship in distress. The vessel only receives these safety at sea messages for the area the vessel is operating in. In addition, Inmarsat C’s  automatic distress calling feature, with fast and reliable alert calling to the Rescue Coordination Centers (RCC) in closest proximity to the vessel in distress, is unparalleled by any other marine communications system.  For this reason, large vessel operators who are required to meet the mandatory GMDSS requirements of the IMO are installing Inmarsat C in lieu of the larger and more expensive Inmarsat A and B.  Similar systems without the distress calling features are available for land mobile and portable use.

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