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PCF
OFFSET
The
GPS
navigation system
relies on
complex
mathematical calculations
to determine
your
position
based on satellite data and other factors. One
factor is the Earths
shape.
Since
the
Earth is not atrue
sphere,
variations
in the calculations
have
to
be made to accommodate deviations. To
make
matters more
complex,
not
everyone
uses
the same data to
determine
what the deviations are. The size and
shape
of the
ellipsoids
that are used
to
approximate
the earth's surface are
improved
often. This can
lead to
errors
if
your navigation
device uses one
ellipsoid,
while
your
chart uses
a different one.
The term used for these
ellipsoids
is "Datum."
To reduce the errorfactor between
datum,
this unit
gives you
the
capability
to move or "offset" the
position
shown on the
display
to match the one
on
the chart. The unit will add this offset to all
position displays
at all times.
Remember,
the GPS error is
very dynamic
and the PCF offset should
never
be used in an
attempt
to cancel the error. In
general
terms this
feature
should
only
be used if
your map
indicates what the
possible
error
is. This feature should
always
be reset to zero
(0)
when finished with that
chart.
at a location
that is
accurately
longitude
position
that is .010
Using
the Position Correction
unit read the same as the chart.
If
you
move,
the unit will con-
tinuously
add the
change
to all
position displays.
This makes it
more
closely
match the datum
used
by
the chart. Forthis rea-
son,you
should be careful when
entering
the PCF offset. This
offset is saved
in
memory.
It
doesn't
change
whenthe unit is
turned
off.
However,
a Preset
does
erase the PCF factor.
INTRODUCTION
The UltraNav II is a
high quality,
wide screen combination sonar and
differntial
ready
OPS receiver
with
performance
that is
second
to
none in
its class.
Using
menu features and
"soft-key" operation,
the UltraNav II is
also one
of the easiest-to-use
products
that
Eagle
has ever built. The wide
"UltravisionTM"
screen shows the underwater world with
high
resolution
and detail. The
display
and
keyboard
are also
lighted
for
night operation.
Installing
an
optional
ST-T
speed/temperature
sensor,
gives digital
boat
speed,
surface
water
temperature,
and distance travelled
(log) displays.
Read this manual
and take itwith
you
the firstfew times
you
use
your
unit.
It makes a
great
reference if
you
need
it.
MOUNTING
Install the UltraNav
II in
any
convenient
location,
provided
there is
clearance behind the
unitwhen it is tilted forthe best
viewing angle.
Holes
in the bracket base
allow wood screw
orthrough-bolt mounting.
You
may
need to
place
a
piece
of
plywood
on the back of thin
fiberglass panels
to
secure the
mounting
hardware. Make certain there is
enough
room behind
the unit to attach the
power
and transducer cables.
The smallest hole that
will
pass
one
power
or transducer
plug
is one inch.
Afterthe hole is
drilled, passthe
transducerconnector
up throughthe
hole
first,
then
pass
the
power
cable down
through
it.
After the cables
have been
routed,
fill the hole with a
good
marine
sealing
compound.
Offset
the bracket to cover the hole. Route the
power
cable
through
the slot and
break out one of the other slots in the bracket for the
transducer cable.
76
1
For
example, suppose you
are
stopped
marked on a chart. Your unit shows a
degrees
less than the one on the chart.
Factor
(PCF)
Offset
feature,
you
make the
Position
Correctq
Factor
LAT
OFFSET:
LOll OFFSET:
N.:,C!PiJO1I1OC.
SLOT
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