Memorex RX 1 Smart Instrukcja Instalacji Pobierz pdf (Strona 193)

Appendix E - Glossary | 191

MAGNETIC DEVIATION

The error introduced into the steering compass reading by nearby ferrous metal

mass distorting the earth magnetic flux field surrounding the compass.

MAGNETIC HEADING

Direction, as sensed by the steering compass, in relation to magnetic north.

MAGNETIC NORTH

Direction in the plane of the observer’s horizon toward the earth’s north magnetic

pole.

MAGNETIC VARIATION

The angle by which magnetic north varies from true north at any given point on

the earth’s surface. This value is automatically added to the magnetic heading

input to provide true heading for calculation and display purposes.

A list of functions in the display. Selection of a function from the list is

accomplished with either the toggle key or the soft keys.

MERCATOR CHART

A map developed by Mercator projection wherein the curved surface of the Earth’s

ellipsoid is projected onto a cylinder and the cylinder is “unwrapped” to form a flat

representation of the ellipsoid.

MERIDIAN

The circumference line of a meridian plane. The meridians 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 message for parity checking

purposes.

PARITY CHECK

A simple statistical operation performed by the software that monitors binary

coded data being transmitted to verify that the received message is the same as

the transmitted message.

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