NMEA 0183 Connection Considerations
• The installation instructions provided with your NMEA 0183
compatible device should contain the information you need to
identify the transmitting (Tx) and receiving (Rx) A (+) and B
(-) wires.
• When connecting NMEA 0183 devices with two transmitting
and two receiving wires, it is not necessary for the NMEA
2000
bus and the NMEA 0183 device to connect to a
®
common ground.
• When connecting a NMEA 0183 device with only one
transmitting (Tx) wire or with only one receiving (Rx) wire, the
NMEA 2000 bus and the NMEA 0183 device must be
connected to a common ground.
NMEA 0183 Connection Diagram
Item
Description
12 Vdc power source
Wiring harness
NMEA 0183 compliant device
Item Garmin Wire
Garmin Wire
Function
Color
Power
Red
Ground
Black
Tx (Out)
Blue
Rx (In)
Brown
Lamp and Horn Connections
The device can be used with a lamp, a horn, or both, to sound or
flash an alert when the chartplotter displays a message. This is
optional, and the alarm wire is not necessary for the device to
function normally. When connecting the device to a lamp or
horn, observe these considerations.
• The alarm circuit switches to a low-voltage state when the
alarm sounds.
• The maximum current is 100 mA, and a relay is needed to
limit the current from the chartplotter to 100 mA.
• To manually toggle visual and audible alerts, you can install
single-pole, single-throw switches.
Item Description
Power source
Power cable
Horn
Lamp
-
+
NMEA 0183 Device Wire
Function
Power
Data ground
Ground
Rx/A (In +)
Tx/A (Out +)
Item Description
Relay (100 mA coil current)
Toggle switches to enable and disable lamp or horn alerts
Item
Wire Color
Red
Black
Yellow
Connecting the Device to a Transducer
Devices that can receive depth information from a Garmin
transducer have a port labeled SONAR. Go to
or contact your local Garmin dealer to determine the appropriate
type of transducer for your needs.
1
Follow the instructions provided with your transducer to install
it on your boat correctly.
2
Route the transducer cable to the back of your device, away
from sources of electrical interference.
3
Connect the transducer cable to the SONAR port on your
device.
Connecting the Device to an External Garmin
Sounder Module
Devices that can receive information from an external Garmin
sounder module have a port labeled ETHERNET. Go to
www.garmin.com
or contact your local Garmin dealer to
determine the appropriate type of sonar device for your needs.
1
Follow the instructions provided with your sounder module to
install it on your boat correctly.
2
Route the Garmin Marine Network cable from the sounder
module to the back of your device, away from sources of
electrical interference.
3
Connect the Garmin Marine Network cable to the
ETHERNET port on your device.
Connecting the Device to a Garmin Marine Radar
Devices that can receive information from a Garmin radar have
a port labeled ETHERNET. Go to
your local Garmin dealer to determine the appropriate type of
radar for your needs.
1
Follow the instructions provided with your Garmin radar to
install it on your boat correctly.
2
Route the Garmin Marine Network cable from the radar to the
back of your device, away from sources of electrical
interference.
3
Connect the Garmin Marine Network cable to the
ETHERNET port on your device.
Radar, Sonar, and Map Sharing Considerations
Devices that can share supplemental map information and view
data from a single radar or sonar module at the same time have
a port labeled ETHERNET. Go to
your local Garmin dealer to determine the appropriate type of
devices for your needs.
When connecting this device to compatible ETHERNET devices,
you should observe these considerations.
• This device is compatible only with other Garmin ETHERNET
devices, and does not share data with Garmin Marine
Network devices such as a GPSMAP 8000 series device.
• This device is not compatible with legacy Garmin sounder
modules such as the GSD
• If your device receives sonar data from a transducer
connected to the SONAR port, it does not share the sonar
data with other ETHERNET devices.
Wire Function
Power
Ground
Alarm
www.garmin.com
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or contact
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or contact
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