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Waypt Lat/Long:
This sections covers the Z-9500's loran
operation.
The ELC-1
loran module must be attached to the Z-9500 for
position
data.
r
Use Position
CI
I
If
you
are east of
Greenwich, England (east longitude), press
the
key
adjacent
to the EAST/WEST label.
Otherwise,
if
everything
on this
screen is
correct,
press
the
key
next
to
the "Use
Position" label.
The
screen at the bottom of this
page appears
next.
.
This menu
gives you
two choices. There are more choices on other
menu
pages.
You can save the
waypoint
under the next available
number,
using
the
"SAVE AS #" label at the
top
of the screen. The
VIEW/SAVE menu stores the
waypoint
under
any
number
you
desire.
(See
the
Saving
Present Position -View and Save
Method.) Pressing
the
key
next to the "More" label
brings up
the "New
Waypt.
Num." label
which lets
you
save the
position
under
any waypoint
number.
Finally,
you
can travel
directly
to the
waypoint
and not save it
by pressing
the
LORAN
-
General
Loran is short for
LOng RAnge Navigation.
It's a
navigation system
that
uses
powerful
low
frequency (100 kHz)
radio transmitters and sensitive
receivers.
Thus,
you
can determine
your position
over
long
distances.
Loran was
developed
and used
during
World War II. At that time it was
called Loran-A and
operated
at a
higher frequency.
Research and
development
continued
during
the fifties. The current Loran
version,
Loran-C,
was introduced in the sixties. It works over
longer
distances
than
Loran-A and it's easier to use.
ACCURACY
The absolute
accuracy
of Loran is between 0.1 and 0.25 nautical
miles,
depending
on
your
location.
Repeatable accuracy (your ability
to
return
to the same
spot)
is 100 feet or better. The difference between the two
types
of
accuracy
is
important.
Absolute
accuracy
tells
you
where
you
are on the
map. Repeatable accuracy
lets
you
find
your way
back to the
same site time after time.
However,
the
accuracy you experience may
not be as
good
as the
numbers above
suggest.
The
crossing angle
of the lines of
position
affects the
accuracy.
The
sharper
the
crossing angle,
the more chance
for
position
error. A
ninety degree crossing angle
is
best,
but it can
vary
down to
thirty degrees
without a
large position
error.
If
you
wish to double check
your
Loran,
first
pick
a
spot
on the chart that
is
clearly
marked with
latitude/longitude
marks. Then
go
to it. Once
you
arrive,
let the Loran
settle,
then
compare
the
position
information on the
Z-9500 to the chart. It should be
very
close.
82
55
N 32°OO.45'
U 83°11.33
r
East/West
Long.
U
NOTE:
Save
Uaypoint
TOl :45360.42
T02 :60365.70
N 32° 00.45'
hi 80°11.33'
Save as 11 1
View/Save
Waypt.
I
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