Installation Instructions

• See the chartplotter owner's manual for a list of the approved
NMEA 0183 sentences that the chartplotter supports.
NMEA 0183 Device Connections
This diagram illustrates two-way connections for both sending
and receiving data. You can also use this diagram for one-way
communication. To receive information from a NMEA 0183
device, refer to items , , , and when connecting the
Garmin device. To transmit information to a NMEA 0183 device,
refer to items , , , and when connecting the Garmin
device.
Item Description
Power source
Power/NMEA 0183 cable
NMEA 0183 device
Item Garmin Wire Function Garmin Wire
Color
NMEA 0183 Device
Wire Function
Power Red Power
Power ground Black Power ground
Data ground Black Data ground
Rx/A (In +) Brown Tx/A (Out +)
Rx/B (In -) Violet Tx/B (Out -)
Tx/A (Out +) Blue Rx/A (In +)
Tx/B (Out -) Gray Rx/B (In -)
If the NMEA 0183 device has only one input (receive, Rx) wire
(no A, B, +, or -), you must leave the gray wire unconnected.
If the NMEA 0183 device has only one output (transmit, Tx) wire
(no A, B, +, or -), you must connect the violet wire to ground.
NMEA 0183 and Power Cable Pinout
Pin Number Wire Function Wire Color
NMEA 0183 Tx/A (Out
+)
Blue
NMEA 0183 Rx/A (In
+)
Brown
NMEA 0183 Tx/B (Out
-)
Gray
NMEA 0183 Rx/B (In
-)
Violet
Alarm Yellow
Accessory on Orange
Ground (shield) Black
VIN Red
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
Relay (100 mA coil current)
Toggle switches to enable and disable lamp or horn alerts
Item Wire Color Wire Function
Red Power
Black Ground
Yellow Alarm
J1939 Engine Network Connection Considerations
NOTICE
You must use a Garmin GPSMAP J1939 accessory cable when
connecting the chartplotter to the J1939 engine network to
prevent corrosion due to moisture. Using a different cable voids
your warranty.
If you have an existing engine network on your boat, it should
already be connected to power. Do not add any additional power
supply.
This chartplotter can connect to an engine network on your boat
to read data from compatible devices such as certain engines.
The engine network follows a standard and uses proprietary
messages.
You should connect only one chartplotter to one engine network.
Connecting more than one chartplotter to one engine network
may result in unexpected behavior.
The port labeled J1939 is used to connect the device to the
existing engine network. You must route the cable within 6 m
(20 ft.) of the engine network backbone.
The Garmin GPSMAP J1939 accessory cable requires
connection to a power source and proper termination. For more
information on connecting to your engine network, see the
manufacturer's engine documentation.
5