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