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the
upper right
corner. To set
it,
simply
enterthe desired
depth
using
the
numbered
keys.
Remember to add
tenths. For
example,
to
set the keel
offset to three
feet,
first
press
the
3,
then
press
the 0
keys. Next,
press
the
key
next to the ENTER label.
Press the
key
next to
the "EXIT" label to
return to the sonar screen.
To enter a
negative
keel
offset,
use the same
steps
as
above,
but
press
the down arrow
keyto
switch the
depth
from
positive
to
negative
before
you
press
the
key
next to the "ENTER" label.
To
turn the keel offset feature
off,
enter
0.0.
CALIBRATE SPEED
The
speed display
on the sonar
screens comes from the
optional
speed
sensor
-
not the GPS receiver. To
calibrate this sensor to
your boat,
first
press
the MENU
key
sixtimes while asonarscreen is
showing.
Now
press
the
key
next to the "CALIBRATE SPEED"
label. The screen shown
below
appears.
Your current boat
speed
is
shown in the
upper
left coner of
the screen. The calibration in
percent
is shown in the
upper
rightcorner.
Now enterthe
per-
cent
change
that is needed to
make the UltraNav li's
speed
display
match
your
actual
speed.
For
example,
if the
UltraNav Ii's
speed display
is
five
percent
slower than
your
actual
speed,
then use a
posi-
tive five
percent.
If the
UltraNav's
speed display
isfive
use a
negative
five
percent speed
calibration.
The
up
and down arrow
keys
change
the factor from
positive
to
negative.
When
you
have the
speedometer calibrated,
press
the
key
next to the
"EXIT" label to return to
the
sonar screen.
PRESET SONAR AND OPS
The UltraNav II has a built-in
memory
that saves all
settings
such
as
sensitivity,
chart
speed,
keel
offset, speed calibration,
and more.
Virtually
all
settings except
for
waypoint
and
route information
is saved in this
memory. (Waypoints, icons,
and
routes are saved in a
separate memory.)
ACCURACY
You
may
have
heard tales of
extraordinary accuracy
from GPS
receivers.
The
DOD
requires accuracy
of 10
to 15 meters from the satellite
system.
However,
only
the
military gets
this
precision.
The
way
the
military keeps
us and other unauthorized
people
from
using
the more
precise
system
is
coding.
In other
words,
the data
coming
from The
satellites is
encrypted.
Civilian OPS receivers
use "C/A Code." It's
accuracy
is
intentionallyworse
than the
military's
"P
Code." in this
manner,
civilian
users worldwide can
•
benefit from excellent
position
fixes.
Meanwhile,
the
military keeps
the
• most accurate
system away
from
potential
enemies.
Theoretically,
C/A
code can
give
accurate
position
fixes
up
to 15 meters. This is more
than
adequate
for most
people.
However
(as
of this
writing),
the
military
isn't satisfied with C/A's
potential
accuracy
in the
hands of the world.
So,
it's
degrading
it further with
"Selective
Availability"
or SA. This is
small,
random errors
intentionally
added to the
system
so
your
accuracy
will
typically
be within 100 meters.
Of
course,
accuracy
also
depends
on the
angle
of the satellite above
the
horizon,
signal-to-noise ratio,
the
number of satellites tracked
at one time
(the
more the
better),
and
other factors. The smallest
ranges
on the
plotter
may
not be usable if
the SA is
high.
The
present position symbol
can move
off the screen even while
you're sifting
still.
MPH
I•
0.0
Don't let this
discourage you,
however. GPS
by
nature has much faster
updates
than other
systems (such
as
Loran),
and
typically
is much
easier
to use.
Accuracy,
even with SA on is
still better than most other
navigation
systems.
You've
purchased
one of
the finest
navigation
instruments on the
market
today.
We
hope you'll
enjoy
it for
many years
to come.
The
EAGLE EGP-1 GPS Module
This GPS receiver is
currently
used in all
Eagle
OPS receivers, It's
small,
rugged,
and fast. The
five channel
design
lets it track all satellites
in view
and
acquire up
to five
satellites at onetime. It sends
position
information
to the UltraNav II once
every
second.
By incorporating
Rockwell's
GPS
receiver
technology
with
Eagle's
state-of-the-art
design
and manufactur-
ing capabilities,
Eagle brings
to the consumer
the most advanced line of
OPS marine
navigation
systems
available in the world.
USE NUMBERED KEYS
TO
ENTER
CALIBRflTION.
USE UP & DOWN
CURSORS
FOR
PLUS OR MINUS,.
percentfasterthan youractual
speed,
then
46
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