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POSITION DISPLAY
-
FULL
DATA MODE
The
position
display
shows GRI
in
use,
water
depth (DEPTH),
TO's for
all stations in the
chain,
station
status,
SNR:
for each
station,
present
position (in
latitude/longitude),
automatic or manual mode
indicator, pri-
mary
or alternate solution
indicator,
and fix
quality.
tri2:
22222.
LOCKED 99
W: 14598.83 LOCKED 95
X:31883.31 LOCKED 79
Brc.fl:
45360.95 LOCKED 99
REE.H:
60866.12 LOCKED
99
I!
I1IiE
MODE
SOUl
FIX QUALITY IMmJu1 (9 )
MESSAGE BOX
The GRI
in
use
and the water
depth
show at the
top
of the screen.
Immediately
beneath these
is the station data box. The TD
(time
difference)
for each station shows to the
right
of the station's letter. The
stations
in
use
by
the bran to calculate the
latitude/longitude
have a
black box around their
letter. In the
example
above,
the Z-9500 is
using
stations
M, V,
and Z to calculate the
present position.
The letters "REC"
to the left of
the station letters show which stations the Z-9500 recom-
mends to use. To the
right
of the
TD's
the
station status shows. This
will be one of five
messages: BLINK, SEARCHING,
LOW
SNR,
CYC
ERR,
or LOCKED.
Blink is a
message
from the station
warning
that it is
not usable at this time.
Searching
means the loran is
trying
to find the
station's
signal.
Low SNR means the
signal-to-noise
ratio is low.
(See
below.) Cyc
Err is short for
Cycle
Error. It means the bran has not
locked onto the correct third
cycle crossing
of the
signal.
Locked means
the
unit has locked on to the thrid
cycle crossing
and is a usable station.
Navigate only
with stations
showing
a "LOCKED"
message!
To the
right
of the station
message
is the
SNR
display.
This shows the
signal-
to-noise ratio or
SNR. The
lalDer
the
number,
the better. The
range
is
0 to 99. Beneath the station box is the
present position display
in
latitude/longitude.
To the
right
of the
position display
are the automatic/
manual
mode,
primary/alternate
solution,
and
fix
quality
indicators. If
the unit is in the automatic
mode,
the letters AUTO
appear.
If the letters
"MAN"
appear,
then it's
in
the manual mode.
The
primary/alternate
solution
display
is similar, If the unit is
in
the
primary mode,
the letters
A mathematical formula
in
the
loran receiver uses TD's to determine the
latitude/longitude position.
Due to the
nature of
loran, your position
in
latitude/longitude
can be on either side of a baseline.
(The
baseline is
an
imaginary straight
tine
connecting
the master and each
secondary
station.)
It's
possible
for the
loran to lock onto the
stations,
give good
fix
qualities
and
signal strengths,
but show the
latitude/longitude
on the
other side of the baseline from
your present position.
These two
posi-
tions
(your present position
and the one on the other side of the
baseline)
are
called
the
primary
and alternate solutions.
They're usually
far
apart, making
it
easy
to tell if the loran is
displaying
a
position
far
from
your
actual location.
However,
if
you're
close to the
baseline,
the
difference between the alternate and
primary
solution could be
only
a
few
miles,
or less. For this reason
alone,
its
always important
to know
your approximate position
when
initializing
or
using
a loran.
To switch from the
primary
to
the alternate
solution,
first
press
the
MENU
key.
Next,
press
the
key adjacent
to
the "CHANGE SETUP"
label. Now
press
the
key
adjacent
to the
"Primary
Sol. OFF" label. The
Z-9500 returns to a loran screen after this selection. If
you're using
a
screen
with
the
latitude/longitude displayed,
the
lat/long
will flash until a
new
position displays.
If the unit doesn't show the
proper
tatitude/
longitude position, you may
have to
change
stations,
then
try switching
the
primary
and alternate
solutions.
•
The solution
currently
in
use
by
the Z-9500 is
displayed
at the
top
of the
position
screen. See the "Position Screen" section for more information.
Check
your position against
the
loran after it
displays
a new
latitude/
longitude. They
should be the same. To switch back from the alternate
to the
primary
solution,
repeat
the above
steps.
The
only
difference is
the label now reads
"Primary
Sol. ON".
70
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