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.
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