Terms
A L A R M
Message
by
w h i c h
signals the occurrence of an event. The alarm
i s indicated
by
a n
tone and a message
(or
icon) o n t h e display.
A L M A N A C
Library
of
coarse satellite orbital characteristics used t o calculate satellite rise
times, set times, angles
of
elevation etc. Almanac data is valid
for
several
m o n t h s .
ALTITUDE
The
height of the
navigator
over
m e a n sea
(taking into
account the ANTENNA
HEIGHT
a s
stated
in
SETUP, in
the User Manual).
ANTENNA HEIGHT
T h e height (over the water line)
in
w h i c h the antenna is installed.
AZIMUTH
In satellite navigation, t h e angular distance measured o n the horizon circle
in
a
direction f r o m the n o r t h p o i n t
in
the horizon t o the satellite point
in
t h e horizon.
BEARING
T h e direction o f one terrestrial point f r o m another, expressed
as
angular dis-
tance
from
n o r t h
clockwise through
360
.
COG
See COURSE
OVER
GROUND
COMFASS HEADING
C o m p a s s
reading
b e f o r e correction
for
deviation and variation.
COURSE
T h e horizontal direction
in which
a
vessel
is
steered
or
intended t o b e steered,
expressed
as
angular distance
from
n o r t h clockwise through
360. (Strictly the
term
applies
to
direction
through
t h e
water,
n o t
the direction intended
t o
be
m a d e g o o d over the ground). The course
is o f t e n designated as
true,
or
compass
as
the reference direction
is
true, magnetic,
or
compass,
ti
v e
I
COURSE
A
line,
as
d r a w n o n
a
chart, extending
in
the direction
of
a course
(rhumb
line).
COURSE
GROUND
Course
made g o o d relative t o t h e sea bed.
GROSS TRACK
E R R O R
The perpendicular distance f r o m the vessel t o the actual
line (track) as
defined
in
Sailplan.
DATUM
The framework o n
which the coordinates used t o define position o n the earth's
surface
is
based.
In the navigator, a d a t u m shift relative t o
84
is
defined
by
t h e following parameters:
and
F
A
Y,
Position o f the reference ellipsoid origin in relation
t o
the
Size a n d shape
of
a
reference ellipsoid.
satellite
ellipsoid
3
Summary of Contents for MK8
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