MERIDIAN
The circumference line of a meridian plane. The merid-
ians define longitude. A special case meridian is the
Greenwich meridian, whose longitude is 0 degrees and to
which all other meridians are referenced.
MMSI
MOTION DYNAMICS
Characteristics of changes in attitude and location of a
moving object according to its application and/or envi-
ronment. For example, vessels at sea in rough waters
may have low forward velocity but high-rate, short-term
changes in attitude due to yaw, pitch and roll.
NAVIGATION SOLUTION
The mathematical derivation of navigation components
(for example, speed, heading, set, drift) from a series of
satellite position updates plotted over time.
NMEA
National Marine Electronics Association. The NMEA
electronics interface specifications have been developed
under the auspices of the Association. The NMEA 0183 is
an internationally recognized specification for interfacing
marine electronics. NMEA 0183 version 2.1 is identical to
IEC 1162-1.
PARALLEL
The perimeter of a parallel plane in the earth’s ellipsoid.
The parallels define latitude. A special case parallel is
the equator, whose latitude is 0 degrees and to which all
other parallels are referenced.
PARITY BIT
A bit added to, or subtracted from, a binary coded mes-
sage for parity checking purposes.
PARITY CHECK
A simple statistical operation performed by the soft-
ware that monitors binary coded data being transmitted
to verify that the received message is the same as the
transmitted message.
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