G-3Saturn B – Chapter 5. Appendices
may also be called SES (Ship Earth Station) or, if on aircraft, AES
(Aeronautical Earth Station).
MID Maritime Identification Digits
MSI Maritime Safety Information, urgent safety-related messages
transmitted via EGC.
NAVAREA , sea area of the world for Coastal Warnings; total of 16
(also called MSI area).
NCS Network Coordination Station, station that supervises all mes-
sages and signals sent in the Inmarsat system; one in each Ocean
Region.
NCSC time-division multiplex (TDM) channel used in the forward
direction to carry NCS signalling messages including Call Announce-
ments, network Status Information (Bulletin Board) and selective
channel clearing.
NMEA National Marine Electronics Association, US industrial organi-
sation whose activities include stipulating standards for marine navi-
gation systems.
OCC Operation Control Centre, Inmarsat centre that monitors entire
Inmarsat system.
Ocean Region area of coverage of a single Inmarsat satellite, from
70°N to 70°S; there are four: Atlantic East, Atlantic West, Pacific,
Indian.
OI/OID Originating Identification Digits, number used by the system to
identify the end terminal making outgoing calls (for billing purposes).
O-QPSK Offset Quadrature Phase Shift Keying.
PC Personal Computer
POR Pacific Ocean Region
Prefix service in Inmarsat-B, two-digit prefix to number called, keyed
in to stipulate special service, such as credit-card call.
Protocol the internal rules in the system that enable communications.
PSDN Packet Switched Data Network, terrestrial network for packet
data communications.
PSTN Public Switched Telephone Network, terrestrial network for
telephone, telefax and data modem services.
PTT Push-To-Talk
RCC Rescue Coordination Centre
RHCP Right Hand Circular Polarization
List of Terms Cont’d
Appendix G – List of Terms Cont’d
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