Eagle Electronics SeaChamp 2000 - Manual (Page 39)

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The optional data cable will contain three wires. Com-1 uses the yellow
wire to transmit, the orange wire to receive and the shield wire for
signal ground.
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.
Read your other product’s owner’s manual for more wiring information.
Power Connections
The unit works from a 12-volt battery system. For the best results,
attach the power cable directly to the battery. You can attach the power
cable to an accessory or power buss, however you may have problems
with electrical interference. Therefore, it's safer to go ahead and attach
the power cable directly to the battery.
Caution:
When using the unit in a saltwater environment, we strongly
recommend that you shut off the power supply to the power cable
when the unit is not in use. When the unit is turned off but still
connected to a power supply, electrolysis can occur in the power
cable plug. This may result in corrosion of the plug body along with
the electrical contacts in the cable and the unit's power socket.
In saltwater environments we recommend you connect the power
cable to the auxiliary power switch included in most boat designs.
If that results in electrical interference, or if such a switch is not
available, we recommend connecting direct to the battery and
installing an inline switch. This will let you shut off power to the
power cable when the unit is not in use. When you are not using
the unit, you should always shut off power to the power cable,
especially when the power cable is disconnected from the unit.
Ground
To Other
Device
Orange (Receive) NMEA Transmit
Shield (Ground) Ground
Com-1 to
your unit
To Other
GPS Receiver
Com-1 to
your unit
Yellow (Transmit) NMEA Receive
Shield (Ground)