Leica MK8, Техническое руководство, Страница: 36 / 48

LEG
One of
stages in a sailplan.
LOCAL ZONE
The time (see TIME ZONE) in which the navigator is located
LOCAL TIME ZONE OFFSET
The number of hours b y which the local time zone differs f r o m Universal Time
Coordinated.
LONGITUDE
The circumference line o f a meridian plane. The meridians define longitude. A
special case meridian is the Greenwich meridian whose longitude
is degrees
and t o which all other meridians are referenced.
MAGNETIC HEADING
Direction as sensed
by
the steering compass in relation t o 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 deviates from true north a t any given point
o n t h e earth's surface.
MERCATOR
C H A R T
A map developed b y Mercator projection wherein the curved surface of the
earth's ellipsoid is projected onto
a
cylinder and the cylinder is "unwrap
f o r m
a
flat representation
of
the ellipsoid (earth model).
NMEA
National Marine Electronics Association. The NMEA electronics interface speci-
fications have been developed under the of the Association. The
NMEA
0 183 is
an internationally recognized specifications for interfacing
marine
electronics.
OFF TRACK
See CROSS TRACK ERROR
POSITION
UPDATE
The recalculation of position b y analysis of satellite orbital data as referenced t o
time.
RHUMB LINE
The course o f a vessel that keeps a constant direction drawn as line on a
chart or globe and cutting across all meridians at the angle. A rhurnb line
is a straight line o n a mercator chart.
based
on
rhumb lines. See GREAT NAVIGATION.
See
SE
LE V
I
LA L I T Y
The sailplan is a sequential list o f waypoints describing the planned voyage.
is in
other words
the
"active route" t o follow.