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 TM 11-5895-1847-12&P
OPERATOR AND UNIT MAINTENANCE
GLOBAL MARITIME DISTRESS AND SAFETY SYSTEM
LOCATION AND DESCRIPTION OF GLOBAL MARITIME DISTRESS
AND SAFETY SYSTEM (GMDSS) MAJOR COMPONENTS
DESCRIPTION OF THE WATCH RECEIVER ANTENNA
The watch receiver antenna (1) is a 23 ft fiberglass antenna that provides the radio signal to the watch keeping
receiver and the Digital Selective Calling (DSC) controller.
DESCRIPTION OF THE NAVTEX RECEIVER ANTENNA
The Navigational TELEX (NAVTEX) antenna (2) is a 23 ft fiberglass antenna that provides the radio signal to the
NAVTEX receiver and weather facsimile machine.
DESCRIPTION OF THE SATELLITE COMMUNICATIONS SYSTEM ANTENNA
The satellite communications system antenna (3) provides satellite data to the satellite communications system.
DESCRIPTION OF THE DSC VHF/FM TRANSCEIVER ANTENNA
The DSC Very High Frequency/Frequency Modulation (VHF/FM) antenna (4) is a 15 ft fiberglass antenna that
provides the radio signal to the DSC VHF/FM transceiver.
DESCRIPTION OF THE GPS ANTENNAS
Two Global Positioning System (GPS) antennas (5) are installed, one for the navigation Precision Lightweight Global
Positioning Receiver (PLGR) and one for the communications PLGR. These antennas provide the GPS signal for
operation of the PLGRs.
DESCRIPTION OF THE WATCH RECEIVER
The watch receiver (6) is a six channel Medium Frequency/High Frequency (MF/HF) watch keeping receiver which,
when combined with the DSC controller, permits scanning of up to six DSC distress and safety frequencies in the
MF/HF bands to monitor these frequencies automatically and continuously. The watch receiver, located in the 9701
GMDSS console, includes built in test equipment which permits the operator to easily and quickly test all six
channels for normal operation. The receiver scans any desired set of the six GMDSS watch frequencies. Federal
Communications Commission (FCC) 80.1091(b)(2) requires that the watch receiver be capable of maintaining DSC
watch on 2187.5 khz, 8414.5 khz and on at least one of the remaining four frequencies. For that reason, the 2187.5
khz and 8414.5 khz frequencies in the watch receiver cannot be de-selected by the operator.
DESCRIPTION OF THE SATELLITE COMMUNICATIONS SYSTEM
The satellite communications system is composed of the INMARSAT-C transceiver (7), data terminal (8), printer (9),
auto switch and omni-directional antenna (3). 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 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 email,
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.
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