signalk-ais700-to-nmea2000

SignalK Node Server plugin that emits NMEA2000 GPS PGNs to the bus, so chartplotters and other N2K devices see own-vessel position even when the only physical N2K GPS source is a Garmin AIS 700 (which emits PGN 129039 AIS Class B Position but not 129025/129029).

Designed to run on a Cerbo GX with Venus OS Large alongside SignalK, using the existing n2k-on-ve.can-socket provider to write back to the boat's NMEA2000 network.

What it does

Subscribes to SignalK self paths and re-emits to the N2K bus via nmea2000JsonOut:

| PGN | Name | Default rate | Default | |---|---|---|---| | 129025 | Position, Rapid Update | 5 Hz | enabled | | 129026 | COG & SOG, Rapid Update | 4 Hz | enabled | | 129029 | GNSS Position Data | 1 Hz | enabled | | 127250 | Vessel Heading | 1 Hz | disabled |

Each PGN is independently toggleable and rate-configurable in the plugin admin UI.

Configuration

• sourceFilter — substring matched against $source of incoming SignalK values. Leave blank to accept any source except this plugin itself. Set to e.g. n2k-on-ve.can-socket.0 to pin it to the Garmin AIS 700's AIS-derived position source.
• Per-PGN enabled + rateHz.

Requirements

• SignalK Node Server (e.g. via Venus OS Large)
• A SignalK provider that converts nmea2000JsonOut → N2K bus frames (n2k-on-ve.can-socket on Cerbo, or the canboatjs N2K provider elsewhere)
• Node ≥ 18

Install

Will be published to npm with the signalk-node-server-plugin keyword so it shows up in the SignalK Appstore. Until then:

cd ~/.signalk/node_modules
git clone https://github.com/thomahawk72/signalk-ais700-to-nmea2000.git
# restart signalk server, enable the plugin in the admin UI

License

MIT