SELECT NMEA
TheAccuNav II sends dataoutthewhitewire onthe
powercableaccording
to standards set by
the NMEA
(National Marine Electronics Association).
This allows the AccuNav II to send position, depth, and navigation
information to "listener"
units,
such as
charting
instruments, autopilots,
and
other marine instruments. The AccuNav II uses the
following NMEA data
protocols: NMEA 0180 and 0183. NMEA 0180 sends steering information
only. It's useful mainly
for
autopilots. NMEA 0183 sends depth, position,
steering, speed, and more. In order to use this
feature, the white wire on
the power
cable must be connected to the NMEA data
input
on the other
instrument. See the installation section in the front of this manual forwiring
connection information.
The AccuNav II also has the
capability to receive differential
data from a beacon receiver.
This
gives the unit much better
accuracy
than normal. Howev-
er, before purchasing and in-
stalling
a beacon
receiver,
make
certain there aretransmitters in
the
area
you
wish to use. Pres-
ently,
the AccuNav II can use
the Magnavox MRB-2A or
?NMEA 0180
F'MAGNAUOD0P3
SETUP B EAC0 N
StarLink MX-50R. Please note that the AccuNav II doesn't send NMEA
0183 data when the Magnavox MRB-2A beacon receiver is activated.
NMEA SETUP
Once
you
connect the
wiring properly,
the AccuNav II must
be told which
NMEA data format to use. Consult the owner's manual of the other
equipment to see which format it needs. Then set the AccuNav II as
follows:
First, press
the MENU key.
Next, press
the
key next to the "CHANGE GPS
SETTINGS" label. Now press
the key next to the
"SELECT NMEA" label,
The screen shown above appears.
GETTING STARTED
Initialization - Power On
In orderforthe
AccuNav
II
to lock ontothe
satellites, it mustfirst find them.
If
you simply
turn the unit on and wait,
the unit will find the satellites
by itself
in 15 minutes or less. This is called "Cold
Start." If
you
let itfindthe
satellites,
the time
display
will
probably be
wrong, since it will be
showing UTC time
orthe time at
Greenwich, England. However,
all other
navigation displays,
including the position display will be correct. (You
can set the time to your
local time.) To
speed up
the satellite acquisition
process, you can initialize
the AccuNav II or "tell it where it is" the first time it's turned on. This
initialization process is
usually done only once and requires the
following
data:
1. Present
position in latitude/longitude
2. Elevation above sea level (altitude)
3. Today's
date and time
The unit
usually only
takes a few minutes or less to
find the satellites once
it's been initialized by the user.
Afterthe
powercable and GPS antenna module are installed, press
the ON
key, then
press
the MENU key. Now
press the key
next to the "CHANGE
GPS SETTINGS" label. Finally, press
the key next to the "SET
LAT, LON,
ALT, TIME, DATE" label. The screen shown below appears next.
This is the GPS
setup
screen.
The settings now in use are
shown at the
top
of the
display.
If
you're using
the unit for the
first time, these settings are
probably wrong
for your posi-
tion and time.To
change any
of
the numbers on this display,
simply press
the
key nexttothe
arrow with the desired label.
For example, to change the
local
time, press
the
key
nextto
the "CHANGE TIME" label.
LATITUDE N 36°08.852'
LONGITUDE 14 9E°SO.484'
ALTITUDE 1696
LOCAL TINE 10:17:23 PM
LOCAL DATE 1/03'1992_
ELATHAHGEAL
UANGETIMr
DATE
The data format
currently
in use shows at
the
top
of the screen. Press the
key next to the desired data output. Now press the CLEAR key. The
AccuNav II will return to the last used GPS screen and send NMEA data
out the white wire on the
power cable.
Note: If
you don't use the "cold stari'feature,
then
you
will
have to
change
all of the
settings
on this page to their correct
values. In other
words, you
can't
simply
enter
your present position and have the unit find the correct
values by itself.
36 9
ENTLY
USING:
INMEA
OFF'MAGNAVOX
rHFIEA 0183'SlIqRLINK DOPS
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