Specifications

Once
the desired route number is in
the
box, press
the
key adjacent
to the•
"SELECT" label.
In this
example,
route number
one is used. The
screen shown
below
appears
next.
Continue
selecting waypoints
in the
order
you
wish to travel in the route
until
all of the desired
waypoints
have
been
picked
for the route.
Each route can have
up
to ten
way-
points.
If
you
make a mistake and
add an undesired
waypoint
to a
route,
press
the
key
adjacent
to the
"CLEAR
ROUTE" label.
This erases all of the
waypoints
in the route. You can then
start the selection
process
over
again.
After
selecting
all of the route's
way-
points, press
the
key adjacent
to the
"EXIT"
label. The UltraNav returns to
the last used loran
display.
a
This is the
waypoint
selection menu. It
lets
you pick
the
waypoints
for the
route. Press the
keys adjacent
to the
up
or down arrows to
scroll
through
the
list of
waypoints.
When the first
way-
point appears
in the selection
box at
the
top
of the
screen,
press
the
key
adjacent
to the "SELECT"
label. A
small "01"
appears
above
the
way-
point's
number.. This
lets
you
know
that this is the
first
waypoint
in the
route.
NOTE:
This section covers the
installation and
operation
of the UltraNav's
Loran.
The ELC-1 Loran-C
module must be
attached to the
UltraNav
for
position
information.
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 belier.
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 UltraNav to the chart.
It should be
very
close.
ROUTE
1102
Loran
-
General
ROUTE 1103
ROUTE
1104
ROUTE
1105
I
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2 LI 78024.51
SELECT
UJPTS
FOR
ROUTE #01
—
—
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QU
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31°53.O6
2 U 78°
24.51
SELECT
UPTS
FOR ROUTE
#01
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64
41
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