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There aretwo boxes on the
left
side of the screen. One reads
"Source
Datum,
the other is
'Display
Datum." Before
chang-
ing
the
Datum,
you
need to
know which datum the
naviga-
tion
receiversupplying position
data to the
GlobalMap
1000 is
using.
For
example,
all Low-
rance GPS receivers
(includ-
ing
the LGC-1 UPS
receiver)
use WOS
84;
all
Lowrance
Loran-C receivers use WGS 72.
The
display
datum box shows the datum
currently displayed
on the
mapping
screen
by
the
GlobalMap
1000. If the
display
datum is different
from the source
datum,
the
GlobalMap
1000 "translates" the source datum
to the
displayed
one. This lets
you display
a
map using any
datum on the
list on the
right
side of the screen.
To
change
either the source or
displayed
datum,
first
press
the
key
on the
right
side of the screen next to the desired box
that
you
wish to
change.
Then
press
the
up
or down arrow
keys
to move
highlight
the datum
you
wish to use. For
example,
to
change
the source datum
from WOS 84 to
WGS
72,
simply pressthe key
nexttothe "Source Datum"
label,
then
press
the down arrow
key
until "WGS 72" is
highlighted.
When the source box
shows the correct
datum, press
the ENT
key.
This saves the datum
displayed
in the source box.
Once
you
have the desired datums
showing
in both the source and the
display
boxes,
pressthe
CLR
key.
This unit returnsto the
mapping
screen,
using
the datums
you specified.
The white and
green
wires are for a NMEA
0183,
version
1.5 interface.
The
GlobalMap
1000 sends data to other electronic
navigation
devices
through
the white wire and receives NMEA data
through
the
green
wire,
If the white and
green
wires are not
used, tape
their ends so that
they
cannot short.
To connect a device to the
GlobalMap
1000's NMEA 0183 version 1.5
input,
attach a twisted
pair
cable
from
the device's NMEA
output
to the
green
and black wires on the
GlobalMap
Il's
power
cable. Solder the
ground
conductor of the twisted
pair
to the black wire on the
power
cable.
To connect a
device
to
the
GlobalMap
1000's NMEA
0183
version
1.5
output,
attach a twisted
pair
cable from the device's
NMEA
input
to the
white and black wires on the
GlobalMap
Il's
power
cable.
Solder the
ground
conductor of the twisted
pair
to
the
black wire
on the
power
cable. See the other instrument's manual for more
wiring
instructions.
The default for both the source and
display
datums is WGS 84.
PCF
(Position
Correction
Factor)
Another method used to reduce the error factor between datum
is
called
PCF,
or Position Correction Factor. This unit
gives you
the
capability
to
move or "offset" the
position
shown on the
display
to match
the one on the
chart. The unitwill add this offset or PCFto all
position displays
at alltimes.
Remember,
the
position
error on
.any radionavigation system
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
56 5
N%IEA
0183,
VERSION 1.5 WIRING CONNECTIONS
Australia
66
Australia 84
European
5J
European
79
Geodetic
49
MAD 2? CONUS
Ord.
Suruey
G.ll.
Tokyo
UGS 72
UGS 84
GLOBALMAP
1000'S
POWER GABLE
OTHER DEVICE'S NMEA 0183,
VERSION 1.5 OUTPUT CABLE
BLACK
GLOBALMAP 1000
RECEIVING
NMEA 0183 VERSION 1.5 DATA
PROM ANOTHER DEVICE
GLOBALMAP 1000 OTHER DEVICE'S NMEA
0183,
POWER CABLE VERSION 1.6 INPUT CABLE
BLACK
GLOBALMAP 1000
SENDING
NMEA
0183
VERSION
1.5
DATA I
ANOTHER DEVICE
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