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Wiring a Garmin VHF 100 or 200 to a NMEA 0183 compliant Chartplotter
To connect the Garmin VHF 100 or VHF 200 to a NMEA 0183 compliant chartplotter, please follow the instructions below:
| VHF Radio | Chartplotter |
| Red (Power)* | Red (Power)* |
| Black (Ground)** | Black (Ground)** |
| Purple Data In Rx (A+) | Data Out Tx (A+) |
| Gray Data In Rx (A-)*** | Data Out Tx (A-) |
| Blue Data out Tx (A+) | Data In Rx (A+) |
| Brown Data Out Tx (B-)**** | Data In Rx (B-) |
*Connect both red wires to the positive side of the power source.
**Connect both black wires to the ground side of the power source.
***If the chartplotter does not have a Data Out -, the gray wire of the VHF radio will need to be connected to the common ground of the boat.
****If the chartplotter does not have a Data In -, the brown wire of the VHF radio needs to remain unconnected. The wire should be trimmed, covered and tied back.
For diagrams of NMEA 0183 wiring, please refer to the Installation Instructions for the VHF radio and the chartplotter.