M
MF Medium Frequency. Radio frequencies (RF) in the range of 300
kHz to 3 MHz. Navtex, which is part of the current Global Maritime
Distress Safety System occupies 518 kHz and 490 kHz for important
digital text broadcasts.
MMSI Maritime Mobile Service Identity. A series of nine digits which are
sent in digital form over a radio frequency channel in order to
uniquely identify ship stations, ship earth stations, coast stations,
coast earth stations, and group calls. These identities are formed
in such a way that the identity or part thereof can be used by
telephone and telex subscribers connected to the general
telecommunications network to call ships automatically.
N
NAVTEX NAVigational TEleX. An international automated medium-
frequency direct-printing service for delivery of navigational and
meteorological warnings and forecasts, as well as urgent marine
safety information to ships.
P
PIN Personal Identification Number
T
TLX TeLeprinter eXchange - also called telex.
U
USB Universal Serial Bus. A specification to establish communication
between devices and a host controller (usually personal
computers). USB is intended to replace many varieties of serial
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