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along PSTN lines.
MRCC Maritime Rescue Co-ordination Centre

MRSC Maritime Rescue Sub-Centre

MSI Maritime Safety Information

MSS Mobile-Satellite Service
MUF Maximum usable frequency

NAVAREA One of twenty one areas defined by IMO for broadcasting
MSI messages.

NAVTEX A low frequency MF-NBDP system defined by IMO to
broadcast and automatic reception of MSI messages.

NBDP Narrow Band Direct Printing (Radiotelex)

NCC Network Control Center. Located in the Inmarsat
headquarters in London, communicates with the NCS's in
each Ocean Region, to make possible the transfer of
information throughout the Inmarsat system.
NCS Network Co-ordination Station

N.I. No Information

NM Nautical Miles

NOC Network Operations Centre
Ocean Region The coverage area of an Inmarsat satellite within which an
SES may send and receive messages.

OTF Optimum Traffic Frequency

Packet Part of a message, typically containing fifteen bytes of data.

PC Public Correspondence
Polling The facility whereby an operational centre send and
instruction (a polling command) to selected SES to perform
a defined task (for exemple, to know if the station is in
radio coverage).

POR Pacific Ocean Region

PS Public Correspondence + Safety and Distress

PSDN Packet Switched Data Network

PSTN Packed Switched Telephone Network
PTS Proceed To Select (dialling tone)