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Operator's Manual
MAGNETIC VARIATION
Glossary
208
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.
MENU
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.
MERCATORCHART
A map developed by Mercator projection wherein the curved sur-
face of the Earth's ellipsoid is projected onto a cylinder and the
cylinder is "unwrapped" to form a flat representation of the ellip-
soid.
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 refer-
enced.
MMSI
MOTION DYNAMICS
Characteristics of changes in attitude and location of a moving
object according to its application and/or environment. For ex-
ample, vessels at sea in rough waters may have low forward veloc-
ity but high-rate, short-term changes in attitude due to yaw, pitch
and roll.
NAVIGATION SOLUTION
The mathematical derivation ofnavigation components (for example,
speed, heading, set, drift) from a series of satellite position updates
plotted over time.
Version 1.5
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