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tem's operation in the United States. Since it's creation, DGPS has be-
come the international maritime standard for marine navigation.
The most popular DGPS system relies on a grid of ground-based trans-
mitters that send correction signals to DGPS receivers. These in turn,
connect to the GPS receiver (such as the SeaCharter 480DF). Eagle of-
fers an optional DGPS receiver for your unit.
See the diagrams on the following page for general wiring connections.
Read your other product’s owner’s manual for more wiring information.
NMEA/DGPS Wiring
(SeaCharter 480DF only)
To exchange NMEA or DGPS data, the SeaCharter 480DF has one
NMEA 0183 version 2.0 communication port. Com port one (Com-1) can
be used to receive NMEA format GPS data or DGPS data. The com port
can also transmit NMEA format GPS data to another device.
The three wires for the com port are combined with the two power
wires to form the power/data cable (see the drawing on the following
page). Com-1 uses the yellow wire to transmit, the orange wire to re-
ceive and the shield wire for signal ground.
Com-1 wiring to receive DGPS position information
from a DGPS receiver.
Com-1 wiring to receive NMEA position information
from some other GPS receiver.
Com-1 wiring to transmit NMEA position information
to another NMEA-compatible device.
Orange (Receive)
Shield (Ground)
Transmit
Ground
Ground
Com-1 to
SeaCharter 480DF
To DGPS
Receiver
To Other
Device
Orange (Receive)
NMEA Transmit
Shield (Ground)
Ground
To Other
GPS Receiver
Shield (Ground)
Com-1 to
SeaCharter 480DF
Com-1 to
SeaCharter 480DF
Yellow (Transmit)
NMEA Receive
Yellow (Transmit)
NMEA Receive