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SATELLITE COMMUNICATIONS SYSTEM |
DESCRIPTION OF THE SATELLITE COMMUNICATIONS SYSTEM
The satellite communications system is composed of the INMARSAT-C (SEASAT 2) transceiver, data terminal, printer, auto switch, and omni-directional antenna. The satellite communications system, also known as INMARSAT-C, offers high integrity distress and routine communication. The satellite communications system incorporates the Global Positioning System (GPS) signal from the Precision Lightweight Global Positioning System Receiver (PLGR) to insert the vessel's position automatically into a distress message. By pushing the required buttons on the INMARSAT-C transceiver, located in the 9701 GMDSS console, a distress message may be sent giving the vessel's identity number and location. The INMARSAT-C is not equipped for voice communication but provides a high quality E-mail, facsimile transmission (FAX), and TELEX communication by using the INMARSAT-C data terminal. The satellite communications system has the capability to receive Maritime Safety Information (MSI) appropriate to the ocean area where the vessel is sailing. MSI is comprised of weather forecasts, navigation warnings, and distress relays.
INMARSAT-C SATELLITE COMMUNICATIONS SYSTEM OPERATION
The INMARSAT-C satellite communications system is comprised of an INMARSAT-C transceiver, data terminal, parallel printer, and INMARSAT-C antenna. The INMARSAT-C transceiver, located in the GMDSS 9701 console, receives and transmits a radio signal to an geosynchronous orbiting satellite allowing distress, E-mail, Fax, and TELEX communications. The transceiver is cabled to the INMARSAT-C antenna located on the yardarm. E-mail, Fax, and TELEX messages are sent using the data terminal. An auto switch routes the received messages to the parallel printer to be printed or viewed by the data terminal. In an emergency situation, a distress may be transmitted from the transceiver. The current ship's position is transferred from the communications Precision Lightweight Global Positioning Receiver (PLGR) through the communications interface and switchbox to the INMARSAT-C. The INMARSAT-C is powered by ship's power through the 9701 console. In the event of an AC system failure, backup power to operate the INMARSAT-C is received from the GMDSS emergency batteries.