Leica MK8, Technical Manual

Page: 37 / 48

S A TE
L
LITE SI G N AL
Transmitted electromagnetic
energy
from
a satellite whose time of arrival
i s
measured by the navigator t o calculate the position of the navigator antenna.
SE LE
T
I V
E
AVA I LAB I
L I
T Y S /A
A system whereby t h e accuracy
of
G P S is reduced.
S/A
is controlled
b y
the
U.S. Department o f Defense.
S/N (SIGNAL-TO-NOISE RATIO)
Quantitative relationship between the useful and non-useful part
of the received
satellite signal. A high S/N indicates a good signal strength.
SOFTWARE
Values programmed and loaded into memory. The values represent a permanent
set
of
instructions for running the automatic functions (computations)
of
the
navigator.
SOG - SPEED OVER GROUND
Speed in relation t o the sea bed.
STEERING
COMPASS
The compass used for navigation.
TIME OFFSET
The number o f hours by which the time zone differs from Universal Time
Coordinated
ZONE
of the
24
longitudinal segments around t h e world, each generally 15
degrees and 1 hour wide. In some regions there are half-hour time zones.
TRUE HEADING
Direction in relation to true north. True heading is compass heading corrected
for MAGNETIC VARIATION and deviation.
TRUE NORTH
Direction along the meridian o f the observer
to the north
pole.
U N I VERSA L TI E 0 0 D
I
N ATE D
Greenwich mean time corrected for polar motion o f the earth and sea-
sonal variation in the earth's rotation.
UPDATE
See
UPDATE.
point, t h e
planned track
of the vessel
position coordi-
nates be stored the navigator. The? point position is the basis of the
range, heading-to-steer, estimated time of steering display
WORLD GEODETIC SYSTEM
Worldwide datums 72
and WGS
84)
used
for satellite navigation sys-
tems. For
all
practical purposes the t w o datums be considered identical
may
thus use the offset figures from the chart
in the navigators
us Offset datum
All charts will b e converted to
R.
37